Changelog

main / unreleased

Grafana Mimir

[CHANGE] Update minimal supported version of Go to 1.22. #9134
[CHANGE] Store-gateway / querier: enable streaming chunks from store-gateways to queriers by default. #6646
[CHANGE] Querier: honor the start/end time range specified in the read hints when executing a remote read request. #8431
[CHANGE] Querier: return only samples within the queried start/end time range when executing a remote read request using "SAMPLES" mode. Previously, samples outside of the range could have been returned. Samples outside of the queried time range may still be returned when executing a remote read request using "STREAMED_XOR_CHUNKS" mode. #8463
[CHANGE] Querier: Set minimum for -querier.max-concurrent to four to prevent queue starvation with querier-worker queue prioritization algorithm; values below the minimum four are ignored and set to the minimum. #9054
[CHANGE] Store-gateway: enabled -blocks-storage.bucket-store.max-concurrent-queue-timeout by default with a timeout of 5 seconds. #8496
[CHANGE] Store-gateway: enabled -blocks-storage.bucket-store.index-header.lazy-loading-concurrency-queue-timeout by default with a timeout of 5 seconds . #8667
[CHANGE] Distributor: Incoming OTLP requests were previously size-limited by using limit from -distributor.max-recv-msg-size option. We have added option -distributor.max-otlp-request-size for limiting OTLP requests, with default value of 100 MiB. #8574
[CHANGE] Distributor: remove metric cortex_distributor_sample_delay_seconds. #8698
[CHANGE] Query-frontend: Remove deprecated frontend.align_queries_with_step YAML configuration. The configuration option has been moved to per-tenant and default limits since Mimir 2.12. #8733 #8735
[CHANGE] Store-gateway: Change default of -blocks-storage.bucket-store.max-concurrent to 200. #8768
[CHANGE] Added new metric cortex_compactor_disk_out_of_space_errors_total which counts how many times a compaction failed due to the compactor being out of disk, alert if there is a single increase. #8237 #8278
[CHANGE] Store-gateway: Remove experimental parameter -blocks-storage.bucket-store.series-selection-strategy. The default strategy is now worst-case. #8702
[CHANGE] Store-gateway: Rename -blocks-storage.bucket-store.series-selection-strategies.worst-case-series-preference to -blocks-storage.bucket-store.series-fetch-preference and promote to stable. #8702
[CHANGE] Querier, store-gateway: remove deprecated -querier.prefer-streaming-chunks-from-store-gateways=true. Streaming from store-gateways is now always enabled. #8696
[CHANGE] Ingester: remove deprecated -ingester.return-only-grpc-errors. #8699 #8828
[CHANGE] Distributor, ruler: remove deprecated -ingester.client.report-grpc-codes-in-instrumentation-label-enabled. #8700
[CHANGE] Ingester client: experimental support for client-side circuit breakers, their configuration options (-ingester.client.circuit-breaker.*) and metrics (cortex_ingester_client_circuit_breaker_results_total, cortex_ingester_client_circuit_breaker_transitions_total) were removed. #8802
[CHANGE] Ingester: circuit breakers do not open in case of per-instance limit errors anymore. Opening can be triggered only in case of push and pull requests exceeding the configured duration. #8854
[CHANGE] Query-frontend: Return 413 Request Entity Too Large if a response shard for an /active_series request is too large. #8861
[CHANGE] Distributor: Promote replying with Retry-After header on retryable errors to stable and set -distributor.retry-after-header.enabled=true by default. #8694
[CHANGE] Distributor: Replace -distributor.retry-after-header.max-backoff-exponent and -distributor.retry-after-header.base-seconds with -distributor.retry-after-header.min-backoff and -distributor.retry-after-header.max-backoff for easier configuration. #8694
[CHANGE] Ingester: increase the default inactivity timeout of active series (-ingester.active-series-metrics-idle-timeout) from 10m to 20m. #8975
[CHANGE] Distributor: Remove -distributor.enable-otlp-metadata-storage flag, which was deprecated in version 2.12. #9069
[CHANGE] Ruler: Removed -ruler.drain-notification-queue-on-shutdown option, which is now enabled by default. #9115
[CHANGE] Querier: allow wrapping errors with context errors only when the former actually correspond to context.Canceled and context.DeadlineExceeded. #9175
[CHANGE] Query-scheduler: Remove the experimental -query-scheduler.use-multi-algorithm-query-queue flag. The new multi-algorithm tree queue is always used for the scheduler. #9210
[CHANGE] Distributor: reject incoming requests until the distributor service has started. #9317
[FEATURE] Alertmanager: Added -alertmanager.log-parsing-label-matchers to control logging when parsing label matchers. This flag is intended to be used with -alertmanager.utf8-strict-mode-enabled to validate UTF-8 strict mode is working as intended. The default value is false. #9173
[FEATURE] Alertmanager: Added -alertmanager.utf8-migration-logging-enabled to enable logging of tenant configurations that are incompatible with UTF-8 strict mode. The default value is false. #9174
[FEATURE] Querier: add experimental streaming PromQL engine, enabled with -querier.query-engine=mimir. #8422 #8430 #8454 #8455 #8360 #8490 #8508 #8577 #8660 #8671 #8677 #8747 #8850 #8872 #8838 #8911 #8909 #8923 #8924 #8925 #8932 #8933 #8934 #8962 #8986 #8993 #8995 #9008 #9017 #9018 #9019 #9120 #9121 #9136 #9139 #9140 #9145 #9191 #9192 #9194 #9196 #9201 #9212 #9225 #9260 #9272 #9277 #9278 #9280 #9281 #9342 #9343
[FEATURE] Experimental Kafka-based ingest storage. #6888 #6894 #6929 #6940 #6951 #6974 #6982 #7029 #7030 #7091 #7142 #7147 #7148 #7153 #7160 #7193 #7349 #7376 #7388 #7391 #7393 #7394 #7402 #7404 #7423 #7424 #7437 #7486 #7503 #7508 #7540 #7621 #7682 #7685 #7694 #7695 #7696 #7697 #7701 #7733 #7734 #7741 #7752 #7838 #7851 #7871 #7877 #7880 #7882 #7887 #7891 #7925 #7955 #7967 #8031 #8063 #8077 #8088 #8135 #8176 #8184 #8194 #8216 #8217 #8222 #8233 #8503 #8542 #8579 #8657 #8686 #8688 #8703 #8706 #8708 #8738 #8750 #8778 #8808 #8809 #8841 #8842 #8845 #8853 #8886 #8988
- What it is:
  - When the new ingest storage architecture is enabled, distributors write incoming write requests to a Kafka-compatible backend, and the ingesters asynchronously replay ingested data from Kafka. In this architecture, the write and read path are de-coupled through a Kafka-compatible backend. The write path and Kafka load is a function of the incoming write traffic, the read path load is a function of received queries. Whatever the load on the read path, it doesn't affect the write path.
- New configuration options:
  - -ingest-storage.enabled
  - -ingest-storage.kafka.*: configures Kafka-compatible backend and how clients interact with it.
  - -ingest-storage.ingestion-partition-tenant-shard-size: configures the per-tenant shuffle-sharding shard size used by partitions ring.
  - -ingest-storage.read-consistency: configures the default read consistency.
  - -ingest-storage.migration.distributor-send-to-ingesters-enabled: enabled tee-ing writes to classic ingesters and Kafka, used during a live migration to the new ingest storage architecture.
  - -ingester.partition-ring.*: configures partitions ring backend.
[FEATURE] Querier: added support for limitk() and limit_ratio() experimental PromQL functions. Experimental functions are disabled by default, but can be enabled setting -querier.promql-experimental-functions-enabled=true in the query-frontend and querier. #8632
[FEATURE] Querier: experimental support for X-Mimir-Chunk-Info-Logger header that triggers logging information about TSDB chunks loaded from ingesters and store-gateways in the querier. The header should contain the comma separated list of labels for which their value will be included in the logs. #8599
[FEATURE] Query frontend: added new query pruning middleware to enable pruning dead code (eg. expressions that cannot produce any results) and simplifying expressions (eg. expressions that can be evaluated immediately) in queries. #9086
[FEATURE] Ruler: added experimental configuration, -ruler.rule-evaluation-write-enabled, to disable writing the result of rule evaluation to ingesters. This feature can be used for testing purposes. #9060
[FEATURE] Ingester: added experimental configuration ingester.ignore-ooo-exemplars. When set to true out of order exemplars are no longer reported to the remote write client. #9151
[ENHANCEMENT] Compactor: Add cortex_compactor_compaction_job_duration_seconds and cortex_compactor_compaction_job_blocks histogram metrics to track duration of individual compaction jobs and number of blocks per job. #8371
[ENHANCEMENT] Rules: Added per namespace max rules per rule group limit. The maximum number of rules per rule groups for all namespaces continues to be configured by -ruler.max-rules-per-rule-group, but now, this can be superseded by the new -ruler.max-rules-per-rule-group-by-namespace option on a per namespace basis. This new limit can be overridden using the overrides mechanism to be applied per-tenant. #8378
[ENHANCEMENT] Rules: Added per namespace max rule groups per tenant limit. The maximum number of rule groups per rule tenant for all namespaces continues to be configured by -ruler.max-rule-groups-per-tenant, but now, this can be superseded by the new -ruler.max-rule-groups-per-tenant-by-namespace option on a per namespace basis. This new limit can be overridden using the overrides mechanism to be applied per-tenant. #8425
[ENHANCEMENT] Ruler: Added support to protect rules namespaces from modification. The -ruler.protected-namespaces flag can be used to specify namespaces that are protected from rule modifications. The header X-Mimir-Ruler-Override-Namespace-Protection can be used to override the protection. #8444
[ENHANCEMENT] Query-frontend: be able to block remote read queries via the per tenant runtime override blocked_queries. #8372 #8415
[ENHANCEMENT] Query-frontend: added remote_read to op supported label values for the cortex_query_frontend_queries_total metric. #8412
[ENHANCEMENT] Query-frontend: log the overall length and start, end time offset from current time for remote read requests. The start and end times are calculated as the miminum and maximum times of the individual queries in the remote read request. #8404
[ENHANCEMENT] Storage Provider: Added option -<prefix>.s3.dualstack-enabled that allows disabling S3 client from resolving AWS S3 endpoint into dual-stack IPv4/IPv6 endpoint. Defaults to true. #8405
[ENHANCEMENT] HA Tracker: Added reporting of most recent elected replica change via cortex_ha_tracker_last_election_timestamp_seconds gauge, logging, and a new column in the HA Tracker status page. #8507
[ENHANCEMENT] Use sd_notify to send events to systemd at start and stop of mimir services. Default systemd mimir.service config now wait for those events with a configurable timeout TimeoutStartSec default is 3 min to handle long start time (ex. store-gateway). #8220 #8555 #8658
[ENHANCEMENT] Alertmanager: Reloading config and templates no longer needs to hit the disk. #4967
[ENHANCEMENT] Compactor: Added experimental -compactor.in-memory-tenant-meta-cache-size option to set size of in-memory cache (in number of items) for parsed meta.json files. This can help when a tenant has many meta.json files and their parsing before each compaction cycle is using a lot of CPU time. #8544
[ENHANCEMENT] Distributor: Interrupt OTLP write request translation when context is canceled or has timed out. #8524
[ENHANCEMENT] Ingester, store-gateway: optimised regular expression matching for patterns like 1.*|2.*|3.*|...|1000.*. #8632
[ENHANCEMENT] Query-frontend: Add header_cache_control to query stats. #8590
[ENHANCEMENT] Query-scheduler: Introduce query-scheduler.use-multi-algorithm-query-queue, which allows use of an experimental queue structure, with no change in external queue behavior. #7873
[ENHANCEMENT] Query-scheduler: Improve CPU/memory performance of experimental query-scheduler. #8871
[ENHANCEMENT] Expose a new s3.trace.enabled configuration option to enable detailed logging of operations against S3-compatible object stores. #8690
[ENHANCEMENT] memberlist: locally-generated messages (e.g. ring updates) are sent to gossip network before forwarded messages. Introduced -memberlist.broadcast-timeout-for-local-updates-on-shutdown option to modify how long to wait until queue with locally-generated messages is empty when shutting down. Previously this was hard-coded to 10s, and wait included all messages (locally-generated and forwarded). Now it defaults to 10s, 0 means no timeout. Increasing this value may help to avoid problem when ring updates on shutdown are not propagated to other nodes, and ring entry is left in a wrong state. #8761
[ENHANCEMENT] Querier: allow using both raw numbers of seconds and duration literals in queries where previously only one or the other was permitted. For example, predict_linear now accepts a duration literal (eg. predict_linear(..., 4h)), and range vector selectors now accept a number of seconds (eg. rate(metric[2])). #8780
[ENHANCEMENT] Ruler: Add ruler.max-independent-rule-evaluation-concurrency to allow independent rules of a tenant to be run concurrently. You can control the amount of concurrency per tenant is controlled via the -ruler.max-independent-rule-evaluation-concurrency-per-tenan as a limit. Use a -ruler.max-independent-rule-evaluation-concurrency value of 0 can be used to disable the feature for all tenants. By default, this feature is disabled. A rule is eligible for concurrency as long as it doesn't depend on any other rules, doesn't have any other rules that depend on it, and has a total rule group runtime that exceeds 50% of its interval by default. The threshold can can be adjusted with -ruler.independent-rule-evaluation-concurrency-min-duration-percentage. #8146 #8858 #8880 #8884
- This work introduces the following metrics:
  - cortex_ruler_independent_rule_evaluation_concurrency_slots_in_use
  - cortex_ruler_independent_rule_evaluation_concurrency_attempts_started_total
  - cortex_ruler_independent_rule_evaluation_concurrency_attempts_incomplete_total
  - cortex_ruler_independent_rule_evaluation_concurrency_attempts_completed_total
[ENHANCEMENT] Expose a new s3.session-token configuration option to enable using temporary security credentials. #8952
[ENHANCEMENT] Add HA deduplication features to the mimir-microservices-mode development environment. #9012
[ENHANCEMENT] Remove experimental -query-frontend.additional-query-queue-dimensions-enabled and -query-scheduler.additional-query-queue-dimensions-enabled. Mimir now always includes "query components" as a queue dimension. #8984 #9135
[ENHANCEMENT] Add a new ingester endpoint to prepare instances to downscale. #8956
[ENHANCEMENT] Query-scheduler: Add query-scheduler.prioritize-query-components which, when enabled, will primarily prioritize dequeuing fairly across queue components, and secondarily prioritize dequeuing fairly across tenants. When disabled, tenant fairness is primarily prioritized. query-scheduler.use-multi-algorithm-query-queue must be enabled in order to use this flag. #9016 #9071
[ENHANCEMENT] Update runtime configuration to read gzip-compressed files with .gz extension. #9074
[ENHANCEMENT] Ingester: add cortex_lifecycler_read_only metric which is set to 1 when ingester's lifecycler is set to read-only mode. #9095
[ENHANCEMENT] Add a new field, encode_time_seconds to query stats log messages, to record the amount of time it takes the query-frontend to encode a response. This does not include any serialization time for downstream components. #9062
[ENHANCEMENT] OTLP: If the flag -distributor.otel-created-timestamp-zero-ingestion-enabled is true, OTel start timestamps are converted to Prometheus zero samples to mark series start. #9131
[ENHANCEMENT] Querier: attach logs emitted during query consistency check to trace span for query. #9213
[ENHANCEMENT] Query-scheduler: Experimental -query-scheduler.prioritize-query-components flag enables the querier-worker queue priority algorithm to take precedence over tenant rotation when dequeuing requests. #9220
[ENHANCEMENT] Add application credential arguments for Openstack Swift storage backend. #9181
[BUGFIX] Ruler: add support for draining any outstanding alert notifications before shutting down. This can be enabled with the -ruler.drain-notification-queue-on-shutdown=true CLI flag. #8346
[BUGFIX] Query-frontend: fix -querier.max-query-lookback enforcement when -compactor.blocks-retention-period is not set, and viceversa. #8388
[BUGFIX] Ingester: fix sporadic not found error causing an internal server error if label names are queried with matchers during head compaction. #8391
[BUGFIX] Ingester, store-gateway: fix case insensitive regular expressions not matching correctly some Unicode characters. #8391
[BUGFIX] Query-frontend: "query stats" log now includes the actual status_code when the request fails due to an error occurring in the query-frontend itself. #8407
[BUGFIX] Store-gateway: fixed a case where, on a quick subsequent restart, the previous lazy-loaded index header snapshot was overwritten by a partially loaded one. #8281
[BUGFIX] Ingester: fixed timestamp reported in the "the sample has been rejected because its timestamp is too old" error when the write request contains only histograms. #8462
[BUGFIX] Store-gateway: store sparse index headers atomically to disk. #8485
[BUGFIX] Query scheduler: fix a panic in request queueing. #8451
[BUGFIX] Querier: fix issue where "context canceled" is logged for trace spans for requests to store-gateways that return no series when chunks streaming is enabled. #8510
[BUGFIX] Alertmanager: Fix per-tenant silence limits not reloaded during runtime. #8456
[BUGFIX] Alertmanager: Fixes a number of bugs in silences which could cause an existing silence to be deleted/expired when updating the silence failed. This could happen when the replacing silence was invalid or exceeded limits. #8525
[BUGFIX] Alertmanager: Fix help message for utf-8-strict-mode. #8572
[BUGFIX] Query-frontend: Ensure that internal errors result in an HTTP 500 response code instead of 422. #8595 #8666
[BUGFIX] Configuration: Multi line envs variables are flatten during injection to be compatible with YAML syntax
[BUGFIX] Querier: fix issue where queries can return incorrect results if a single store-gateway returns overlapping chunks for a series. #8827
[BUGFIX] HA Tracker: store correct timestamp for last received request from elected replica. #8821
[BUGFIX] Querier: do not return grpc: the client connection is closing errors as HTTP 499. #8865 #8888
[BUGFIX] Compactor: fix a race condition between different compactor replicas that may cause a deleted block to be still referenced as non-deleted in the bucket index. #8905
[BUGFIX] Querier: fix issue where some native histogram-related warnings were not emitted when rate() was used over native histograms. #8918
[BUGFIX] Ruler: map invalid org-id errors to 400 status code. #8935
[BUGFIX] Querier: Fix invalid query results when multiple chunks are being merged. #8992
[BUGFIX] Query-frontend: return annotations generated during evaluation of sharded queries. #9138
[BUGFIX] Querier: Support optional start and end times on /prometheus/api/v1/labels, /prometheus/api/v1/label/<label>/values, and /prometheus/api/v1/series when max_query_into_future: 0. #9129
[BUGFIX] Alertmanager: Fix config validation gap around unreferenced templates. #9207
[BUGFIX] Alertmanager: Fix goroutine leak when stored config fails to apply and there is no existing tenant alertmanager #9211
[BUGFIX] Querier: fix issue where both recently compacted blocks and their source blocks can be skipped during querying if store-gateways are restarting. #9224
[BUGFIX] Alertmanager: fix receiver firewall to detect 0.0.0.0 and IPv6 interface-local multicast address as local addresses. #9308

Mixin

[CHANGE] Dashboards: set default auto-refresh rate to 5m. #8758
[ENHANCEMENT] Dashboards: allow switching between using classic or native histograms in dashboards.
- Overview dashboard: status, read/write latency and queries/ingestion per sec panels, cortex_request_duration_seconds metric. #7674 #8502 #8791
- Writes dashboard: cortex_request_duration_seconds metric. #8757 #8791
- Reads dashboard: cortex_request_duration_seconds metric. #8752
- Rollout progress dashboard: cortex_request_duration_seconds metric. #8779
- Alertmanager dashboard: cortex_request_duration_seconds metric. #8792
- Ruler dashboard: cortex_request_duration_seconds metric. #8795
- Queries dashboard: cortex_request_duration_seconds metric. #8800
- Remote ruler reads dashboard: cortex_request_duration_seconds metric. #8801
[ENHANCEMENT] Alerts: MimirRunningIngesterReceiveDelayTooHigh alert has been tuned to be more reactive to high receive delay. #8538
[ENHANCEMENT] Dashboards: improve end-to-end latency and strong read consistency panels when experimental ingest storage is enabled. #8543 #8830
[ENHANCEMENT] Dashboards: Add panels for monitoring ingester autoscaling when not using ingest-storage. These panels are disabled by default, but can be enabled using the autoscaling.ingester.enabled: true config option. #8484
[ENHANCEMENT] Dashboards: Add panels for monitoring store-gateway autoscaling. These panels are disabled by default, but can be enabled using the autoscaling.store_gateway.enabled: true config option. #8824
[ENHANCEMENT] Dashboards: add panels to show writes to experimental ingest storage backend in the "Mimir / Ruler" dashboard, when _config.show_ingest_storage_panels is enabled. #8732
[ENHANCEMENT] Dashboards: show all series in tooltips on time series dashboard panels. #8748
[ENHANCEMENT] Dashboards: add compactor autoscaling panels to "Mimir / Compactor" dashboard. The panels are disabled by default, but can be enabled setting _config.autoscaling.compactor.enabled to true. #8777
[ENHANCEMENT] Alerts: added MimirKafkaClientBufferedProduceBytesTooHigh alert. #8763
[ENHANCEMENT] Dashboards: added "Kafka produced records / sec" panel to "Mimir / Writes" dashboard. #8763
[ENHANCEMENT] Alerts: added MimirStrongConsistencyOffsetNotPropagatedToIngesters alert, and rename MimirIngesterFailsEnforceStrongConsistencyOnReadPath alert to MimirStrongConsistencyEnforcementFailed. #8831
[ENHANCEMENT] Dashboards: remove "All" option for namespace dropdown in dashboards. #8829
[ENHANCEMENT] Dashboards: add Kafka end-to-end latency outliers panel in the "Mimir / Writes" dashboard. #8948
[ENHANCEMENT] Dashboards: add "Out-of-order samples appended" panel to "Mimir / Tenants" dashboard. #8939
[ENHANCEMENT] Alerts: RequestErrors and RulerRemoteEvaluationFailing have been enriched with a native histogram version. #9004
[ENHANCEMENT] Dashboards: add 'Read path' selector to 'Mimir / Queries' dashboard. #8878
[ENHANCEMENT] Dashboards: add annotation indicating active series are being reloaded to 'Mimir / Tenants' dashboard. #9257
[ENHANCEMENT] Dashboards: limit results on the 'Failed evaluations rate' panel of the 'Mimir / Tenants' dashboard to 50 to avoid crashing the page when there are many failing groups. #9262
[FEATURE] Alerts: add MimirGossipMembersEndpointsOutOfSync alert. #9347
[BUGFIX] Dashboards: fix "current replicas" in autoscaling panels when HPA is not active. #8566
[BUGFIX] Alerts: do not fire MimirRingMembersMismatch during the migration to experimental ingest storage. #8727
[BUGFIX] Dashboards: avoid over-counting of ingesters metrics when migrating to experimental ingest storage. #9170
[BUGFIX] Dashboards: fix job_prefix not utilized in jobSelector. #9155

Jsonnet

[CHANGE] Changed the following config options when the experimental ingest storage is enabled: #8874
- ingest_storage_ingester_autoscaling_min_replicas changed to ingest_storage_ingester_autoscaling_min_replicas_per_zone
- ingest_storage_ingester_autoscaling_max_replicas changed to ingest_storage_ingester_autoscaling_max_replicas_per_zone
[CHANGE] Changed the overrides configmap generation to remove any field with null value. #9116
[CHANGE] $.replicaTemplate function now takes replicas and labelSelector parameter. #9248
[CHANGE] Renamed ingest_storage_ingester_autoscaling_replica_template_custom_resource_definition_enabled to replica_template_custom_resource_definition_enabled. #9248
[FEATURE] Add support for automatically deleting compactor, store-gateway, ingester and read-write mode backend PVCs when the corresponding StatefulSet is scaled down. #8382 #8736
[FEATURE] Automatically set GOMAXPROCS on ingesters. #9273
[ENHANCEMENT] Added the following config options to set the number of partition ingester replicas when migrating to experimental ingest storage. #8517
- ingest_storage_migration_partition_ingester_zone_a_replicas
- ingest_storage_migration_partition_ingester_zone_b_replicas
- ingest_storage_migration_partition_ingester_zone_c_replicas
[ENHANCEMENT] Distributor: increase -distributor.remote-timeout when the experimental ingest storage is enabled. #8518
[ENHANCEMENT] Memcached: Update to Memcached 1.6.28 and memcached-exporter 0.14.4. #8557
[ENHANCEMENT] Rollout-operator: Allow the rollout-operator to be used as Kubernetes statefulset webhook to enable no-downscale and prepare-downscale annotations to be used on ingesters or store-gateways. #8743
[ENHANCEMENT] Do not deploy ingester-zone-c when experimental ingest storage is enabled and ingest_storage_ingester_zones is configured to 2. #8776
[ENHANCEMENT] Added the config option ingest_storage_migration_classic_ingesters_no_scale_down_delay to disable the downscale delay on classic ingesters when migrating to experimental ingest storage. #8775 #8873
[ENHANCEMENT] Configure experimental ingest storage on query-frontend too when enabled. #8843
[ENHANCEMENT] Allow to override Kafka client ID on a per-component basis. #9026
[ENHANCEMENT] Rollout-operator's access to ReplicaTemplate is now configured via config option rollout_operator_replica_template_access_enabled. #9252
[ENHANCEMENT] Added support for new way of downscaling ingesters, using rollout-operator's resource-mirroring feature and read-only mode of ingesters. This can be enabled by using ingester_automated_downscale_v2_enabled config option. This is mutually exclusive with both ingester_automated_downscale_enabled (previous downscale mode) and ingest_storage_ingester_autoscaling_enabled (autoscaling for ingest-storage).
[BUGFIX] Added missing node affinity matchers to write component. #8910

Mimirtool

[CHANGE] Analyze Rules: Count recording rules used in rules group as used. #6133
[CHANGE] Remove deprecated --rule-files flag in favor of CLI arguments for the following commands: #8701
- mimirtool rules load
- mimirtool rules sync
- mimirtool rules diff
- mimirtool rules check
- mimirtool rules prepare
[ENHANCEMENT] Remote read and backfill now supports the experimental native histograms. #9156

Mimir Continuous Test

[CHANGE] Use test metrics that do not pass through 0 to make identifying incorrect results easier. #8630
[CHANGE] Allowed authentication to Mimir using both Tenant ID and basic/bearer auth. #9038
[FEATURE] Experimental support for the -tests.send-chunks-debugging-header boolean flag to send the X-Mimir-Chunk-Info-Logger: series_id header with queries. #8599
[ENHANCEMENT] Include human-friendly timestamps in diffs logged when a test fails. #8630
[ENHANCEMENT] Add histograms to measure latency of read and write requests. #8583
[ENHANCEMENT] Log successful test runs in addition to failed test runs. #8817
[ENHANCEMENT] Series emitted by continuous-test now distribute more uniformly across ingesters. #9218 #9243
[ENHANCEMENT] Configure User-Agent header for the Mimir client via -tests.client.user-agent. #9338
[BUGFIX] Initialize test result metrics to 0 at startup so that alerts can correctly identify the first failure after startup. #8630

Query-tee

[CHANGE] If a preferred backend is configured, then query-tee always returns its response, regardless of the response status code. Previously, query-tee would only return the response from the preferred backend if it did not have a 5xx status code. #8634
[ENHANCEMENT] Emit trace spans from query-tee. #8419
[ENHANCEMENT] Log trace ID (if present) with all log messages written while processing a request. #8419
[ENHANCEMENT] Log user agent when processing a request. #8419
[ENHANCEMENT] Add time parameter to proxied instant queries if it is not included in the incoming request. This is optional but enabled by default, and can be disabled with -proxy.add-missing-time-parameter-to-instant-queries=false. #8419
[ENHANCEMENT] Add support for sending only a proportion of requests to all backends, with the remainder only sent to the preferred backend. The default behaviour is to send all requests to all backends. This can be configured with -proxy.secondary-backends-request-proportion. #8532
[ENHANCEMENT] Check annotations emitted by both backends are the same when comparing responses from two backends. #8660
[ENHANCEMENT] Compare native histograms in query results when comparing results between two backends. #8724
[ENHANCEMENT] Don't consider responses to be different during response comparison if both backends' responses contain different series, but all samples are within the recent sample window. #8749 #8894
[ENHANCEMENT] When the expected and actual response for a matrix series is different, the full set of samples for that series from both backends will now be logged. #8947
[ENHANCEMENT] Wait up to -server.graceful-shutdown-timeout for inflight requests to finish when shutting down, rather than immediately terminating inflight requests on shutdown. #8985
[ENHANCEMENT] Optionally consider equivalent error messages the same when comparing responses. Enabled by default, disable with -proxy.require-exact-error-match=true. #9143 #9350
[BUGFIX] Ensure any errors encountered while forwarding a request to a backend (eg. DNS resolution failures) are logged. #8419
[BUGFIX] The comparison of the results should not fail when either side contains extra samples from within SkipRecentSamples duration. #8920

Documentation

[ENHANCEMENT] Specify in which component the configuration flags -compactor.blocks-retention-period, -querier.max-query-lookback, -query-frontend.max-total-query-length, -query-frontend.max-query-expression-size-bytes are applied and that they are applied to remote read as well. #8433
[ENHANCEMENT] Provide more detailed recommendations on how to migrate from classic to native histograms. #8864
[ENHANCEMENT] Clarify that {namespace} and {groupName} path segments in the ruler config API should be URL-escaped. #8969
[ENHANCEMENT] Include stalled compactor network drive information in runbooks. #9297
[ENHANCEMENT] Document /ingester/prepare-partition-downscale and /ingester/prepare-instance-ring-downscale endpoints. #9132
[ENHANCEMENT] Describe read-only mode of ingesters in component documentation. #9132

Tools

[CHANGE] wal-reader: Renamed -series-entries to -print-series. Renamed -print-series-with-samples to -print-samples. #8568
[FEATURE] query-bucket-index: add new tool to query a bucket index file and print the blocks that would be used for a given query time range. #8818
[FEATURE] kafkatool: add new CLI tool to operate Kafka. Supported commands: #9000
- brokers list-leaders-by-partition
- consumer-group commit-offset
- consumer-group copy-offset
- consumer-group list-offsets
- create-partitions
[ENHANCEMENT] wal-reader: References to unknown series from Samples, Exemplars, histogram or tombstones records are now always logged. #8568
[ENHANCEMENT] tsdb-series: added -stats option to print min/max time of chunks, total number of samples and DPM for each series. #8420
[ENHANCEMENT] tsdb-print-chunk: print counter reset information for native histograms. #8812
[ENHANCEMENT] grpcurl-query-ingesters: print counter reset information for native histograms. #8820
[ENHANCEMENT] grpcurl-query-ingesters: concurrently query ingesters. #9102
[ENHANCEMENT] grpcurl-query-ingesters: sort series and chunks in output. #9180
[ENHANCEMENT] grpcurl-query-ingesters: print full chunk timestamps, not just time component. #9180
[ENHANCEMENT] tsdb-series: Added -json option to generate JSON output for easier post-processing. #8844
[ENHANCEMENT] tsdb-series: Added -min-time and -max-time options to filter samples that are used for computing data-points per minute. #8844
[ENHANCEMENT] mimir-rules-action: Added new input to support matching target namespaces by regex. #9244
[ENHANCEMENT] mimir-rules-action: Added new inputs to support ignoring namespaces and ignoring namespaces by regex. #9258 #9324

2.13.0

Grafana Mimir

[CHANGE] Build: grafana/mimir docker image is now based on gcr.io/distroless/static-debian12 image. Alpine-based docker image is still available as grafana/mimir-alpine, until Mimir 2.15. #8204 #8235
[CHANGE] Ingester: /ingester/flush endpoint is now only allowed to execute only while the ingester is in Running state. The 503 status code is returned if the endpoint is called while the ingester is not in Running state. #7486
[CHANGE] Distributor: Include label name in err-mimir-label-value-too-long error message: #7740
[CHANGE] Ingester: enabled 1 out 10 errors log sampling by default. All the discarded samples will still be tracked by the cortex_discarded_samples_total metric. The feature can be configured via -ingester.error-sample-rate (0 to log all errors). #7807
[CHANGE] Query-frontend: Query results caching and experimental query blocking now utilize the PromQL string-formatted query format rather than the unvalidated query as submitted to the frontend. #7742
- Query results caching should be more stable as all equivalent queries receive the same cache key, but there may be cache churn on first deploy with the updated format
- Query blocking can no longer be circumvented with an equivalent query in a different format; see Configure queries to block
[CHANGE] Query-frontend: stop using -validation.create-grace-period to clamp how far into the future a query can span. #8075
[CHANGE] Clamp GOMAXPROCS to runtime.NumCPU. #8201
[CHANGE] Anonymous usage statistics tracking: add CPU usage percentage tracking. #8282
[CHANGE] Added new metric cortex_compactor_disk_out_of_space_errors_total which counts how many times a compaction failed due to the compactor being out of disk. #8237
[CHANGE] Anonymous usage statistics tracking: report active series in addition to in-memory series. #8279
[CHANGE] Ruler: evaluation_delay field in the rule group configuration has been deprecated. Please use query_offset instead (it has the same exact meaning and behaviour). #8295
[CHANGE] General: remove -log.buffered. The configuration option has been enabled by default and deprecated since Mimir 2.11. #8395
[CHANGE] Ruler: promote tenant federation from experimental to stable. #8400
[CHANGE] Ruler: promote -ruler.recording-rules-evaluation-enabled and -ruler.alerting-rules-evaluation-enabled from experimental to stable. #8400
[CHANGE] General: promote -tenant-federation.max-tenants from experimental to stable. #8400
[FEATURE] Continuous-test: now runable as a module with mimir -target=continuous-test. #7747
[FEATURE] Store-gateway: Allow specific tenants to be enabled or disabled via -store-gateway.enabled-tenants or -store-gateway.disabled-tenants CLI flags or their corresponding YAML settings. #7653
[FEATURE] New -<prefix>.s3.bucket-lookup-type flag configures lookup style type, used to access bucket in s3 compatible providers. #7684
[FEATURE] Querier: add experimental streaming PromQL engine, enabled with -querier.promql-engine=mimir. #7693 #7898 #7899 #8023 #8058 #8096 #8121 #8197 #8230 #8247 #8270 #8276 #8277 #8291 #8303 #8340 #8256 #8348
[FEATURE] New /ingester/unregister-on-shutdown HTTP endpoint allows dynamic access to ingesters' -ingester.ring.unregister-on-shutdown configuration. #7739
[FEATURE] Server: added experimental PROXY protocol support. The PROXY protocol support can be enabled via -server.proxy-protocol-enabled=true. When enabled, the support is added both to HTTP and gRPC listening ports. #7698
[FEATURE] Query-frontend, querier: new experimental /cardinality/active_native_histogram_metrics API to get active native histogram metric names with statistics about active native histogram buckets. #7982 #7986 #8008
[FEATURE] Alertmanager: Added -alertmanager.max-silences-count and -alertmanager.max-silence-size-bytes to set limits on per tenant silences. Disabled by default. #8241 #8249
[FEATURE] Ingester: add experimental support for the server-side circuit breakers when writing to and reading from ingesters. This can be enabled using -ingester.push-circuit-breaker.enabled and -ingester.read-circuit-breaker.enabled options. Further -ingester.push-circuit-breaker.* and -ingester.read-circuit-breaker.* options for configuring circuit-breaker are available. Added metrics cortex_ingester_circuit_breaker_results_total, cortex_ingester_circuit_breaker_transitions_total, cortex_ingester_circuit_breaker_current_state and cortex_ingester_circuit_breaker_request_timeouts_total. #8180 #8285 #8315 #8446
[FEATURE] Distributor, ingester: add new setting -validation.past-grace-period to limit how old (based on the wall clock minus OOO window) the ingested samples can be. The default 0 value disables this limit. #8262
[ENHANCEMENT] Distributor: add metrics cortex_distributor_samples_per_request and cortex_distributor_exemplars_per_request to track samples/exemplars per request. #8265
[ENHANCEMENT] Reduced memory allocations in functions used to propagate contextual information between gRPC calls. #7529
[ENHANCEMENT] Distributor: add experimental limit for exemplars per series per request, enabled with -distributor.max-exemplars-per-series-per-request, the number of discarded exemplars are tracked with cortex_discarded_exemplars_total{reason="too_many_exemplars_per_series_per_request"} #7989 #8010
[ENHANCEMENT] Store-gateway: merge series from different blocks concurrently. #7456
[ENHANCEMENT] Store-gateway: Add stage="wait_max_concurrent" to cortex_bucket_store_series_request_stage_duration_seconds which records how long the query had to wait for its turn for -blocks-storage.bucket-store.max-concurrent. #7609
[ENHANCEMENT] Querier: add cortex_querier_federation_upstream_query_wait_duration_seconds to observe time from when a querier picks up a cross-tenant query to when work begins on its single-tenant counterparts. #7209
[ENHANCEMENT] Compactor: Add cortex_compactor_block_compaction_delay_seconds metric to track how long it takes to compact blocks since the blocks are created. #7635
[ENHANCEMENT] Store-gateway: add outcome label to cortex_bucket_stores_gate_duration_seconds histogram metric. Possible values for the outcome label are: rejected_canceled, rejected_deadline_exceeded, rejected_other, and permitted. #7784
[ENHANCEMENT] Query-frontend: use zero-allocation experimental decoder for active series queries via -query-frontend.use-active-series-decoder. #7665
[ENHANCEMENT] Go: updated to 1.22.2. #7802
[ENHANCEMENT] Query-frontend: support limit parameter on /prometheus/api/v1/label/{name}/values and /prometheus/api/v1/labels endpoints. #7722
[ENHANCEMENT] Expose TLS configuration for the S3 backend client. #7959
[ENHANCEMENT] Rules: Support expansion of native histogram values when using rule templates #7974
[ENHANCEMENT] Rules: Add metric cortex_prometheus_rule_group_last_restore_duration_seconds which measures how long it takes to restore rule groups using the ALERTS_FOR_STATE series #7974
[ENHANCEMENT] OTLP: Improve remote write format translation performance by using label set hashes for metric identifiers instead of string based ones. #8012
[ENHANCEMENT] Querying: Remove OpEmptyMatch from regex concatenations. #8012
[ENHANCEMENT] Store-gateway: add -blocks-storage.bucket-store.max-concurrent-queue-timeout. When set, queries at the store-gateway's query gate will not wait longer than that to execute. If a query reaches the wait timeout, then the querier will retry the blocks on a different store-gateway. If all store-gateways are unavailable, then the query will fail with err-mimir-store-consistency-check-failed. #7777 #8149
[ENHANCEMENT] Store-gateway: add -blocks-storage.bucket-store.index-header.lazy-loading-concurrency-queue-timeout. When set, loads of index-headers at the store-gateway's index-header lazy load gate will not wait longer than that to execute. If a load reaches the wait timeout, then the querier will retry the blocks on a different store-gateway. If all store-gateways are unavailable, then the query will fail with err-mimir-store-consistency-check-failed. #8138
[ENHANCEMENT] Ingester: Optimize querying with regexp matchers. #8106
[ENHANCEMENT] Distributor: Introduce -distributor.max-request-pool-buffer-size to allow configuring the maximum size of the request pool buffers. #8082
[ENHANCEMENT] Store-gateway: improve performance when streaming chunks to queriers is enabled (-querier.prefer-streaming-chunks-from-store-gateways=true) and the query selects fewer than -blocks-storage.bucket-store.batch-series-size series (defaults to 5000 series). #8039
[ENHANCEMENT] Ingester: active series are now updated along with owned series. They decrease when series change ownership between ingesters. This helps provide a more accurate total of active series when ingesters are added. This is only enabled when -ingester.track-ingester-owned-series or -ingester.use-ingester-owned-series-for-limits are enabled. #8084
[ENHANCEMENT] Query-frontend: include route name in query stats log lines. #8191
[ENHANCEMENT] OTLP: Speed up conversion from OTel to Mimir format by about 8% and reduce memory consumption by about 30%. Can be disabled via -distributor.direct-otlp-translation-enabled=false #7957
[ENHANCEMENT] Ingester/Querier: Optimise regexps with long lists of alternates. #8221, #8234
[ENHANCEMENT] Ingester: Include more detail in tracing of queries. #8242
[ENHANCEMENT] Distributor: add insight=true to remote-write and OTLP write handlers when the HTTP response status code is 4xx. #8294
[ENHANCEMENT] Ingester: reduce locked time while matching postings for a label, improving the write latency and compaction speed. #8327
[ENHANCEMENT] Ingester: reduce the amount of locks taken during the Head compaction's garbage-collection process, improving the write latency and compaction speed. #8327
[ENHANCEMENT] Query-frontend: log the start, end time and matchers for remote read requests to the query stats logs. #8326 #8370 #8373
[BUGFIX] Distributor: prometheus retry on 5xx and 429 errors, while otlp collector only retry on 429, 502, 503 and 504, mapping other 5xx errors to the retryable ones in otlp endpoint. #8324 #8339
[BUGFIX] Distributor: make OTLP endpoint return marshalled proto bytes as response body for 4xx/5xx errors. #8227
[BUGFIX] Rules: improve error handling when querier is local to the ruler. #7567
[BUGFIX] Querier, store-gateway: Protect against panics raised during snappy encoding. #7520
[BUGFIX] Ingester: Prevent timely compaction of empty blocks. #7624
[BUGFIX] Querier: Don't cache context.Canceled errors for bucket index. #7620
[BUGFIX] Store-gateway: account for "other" time in LabelValues and LabelNames requests. #7622
[BUGFIX] Query-frontend: Don't panic when using the -query-frontend.downstream-url flag. #7651
[BUGFIX] Ingester: when receiving multiple exemplars for a native histogram via remote write, sort them and only report an error if all are older than the latest exemplar as this could be a partial update. #7640 #7948 #8014
[BUGFIX] Ingester: don't retain blocks if they finish exactly on the boundary of the retention window. #7656
[BUGFIX] Bug-fixes and improvements to experimental native histograms. #7744 #7813
[BUGFIX] Querier: return an error when a query uses label_join with an invalid destination label name. #7744
[BUGFIX] Compactor: correct outstanding job estimation in metrics and compaction-planner tool when block labels differ. #7745
[BUGFIX] Ingester: turn native histogram validation errors in TSDB into soft ingester errors that result in returning 4xx to the end-user instead of 5xx. In the case of TSDB validation errors, the counter cortex_discarded_samples_total will be increased with the reason label set to "invalid-native-histogram". #7736 #7773
[BUGFIX] Do not wrap error message with sampled 1/<frequency> if it's not actually sampled. #7784
[BUGFIX] Store-gateway: do not track cortex_querier_blocks_consistency_checks_failed_total metric if query has been canceled or interrued due to any error not related to blocks consistency check failed. #7752
[BUGFIX] Ingester: ignore instances with no tokens when calculating local limits to prevent discards during ingester scale-up #7881
[BUGFIX] Ingester: do not reuse exemplars slice in the write request if there are more than 10 exemplars per series. This should help to reduce the in-use memory in case of few requests with a very large number of exemplars. #7936
[BUGFIX] Distributor: fix down scaling of native histograms in the distributor when timeseries unmarshal cache is in use. #7947
[BUGFIX] Distributor: fix cardinality API to return more accurate number of in-memory series when number of zones is larger than replication factor. #7984
[BUGFIX] All: fix config validation for non-ingester modules, when ingester's ring is configured with spread-minimizing token generation strategy. #7990
[BUGFIX] Ingester: copy LabelValues strings out of mapped memory to avoid a segmentation fault if the region becomes unmapped before the result is marshaled. #8003
[BUGFIX] OTLP: Don't generate target_info unless at least one identifying label is defined. #8012
[BUGFIX] OTLP: Don't generate target_info unless there are metrics. #8012
[BUGFIX] Query-frontend: Experimental query queue splitting: fix issue where offset and range selector duration were not considered when predicting query component. #7742
[BUGFIX] Querying: Empty matrix results were incorrectly returning null instead of []. #8029
[BUGFIX] All: don't increment thanos_objstore_bucket_operation_failures_total metric for cancelled requests. #8072
[BUGFIX] Query-frontend: fix empty metric name matcher not being applied under certain conditions. #8076
[BUGFIX] Querying: Fix regex matching of multibyte runes with dot operator. #8089
[BUGFIX] Querying: matrix results returned from instant queries were not sorted by series. #8113
[BUGFIX] Query scheduler: Fix a crash in result marshaling. #8140
[BUGFIX] Store-gateway: Allow long-running index scans to be interrupted. #8154
[BUGFIX] Query-frontend: fix splitting of queries using @ start() and @end() modifiers on a subquery. Previously the start() and end() would be evaluated using the start end end of the split query instead of the original query. #8162
[BUGFIX] Distributor: Don't discard time series with invalid exemplars, just drop affected exemplars. #8224
[BUGFIX] Ingester: fixed in-memory series count when replaying a corrupted WAL. #8295
[BUGFIX] Ingester: fix context cancellation handling when a query is busy looking up series in the TSDB index and -blocks-storage.tsdb.head-postings-for-matchers-cache* or -blocks-storage.tsdb.block-postings-for-matchers-cache* are in use. #8337
[BUGFIX] Querier: fix edge case where bucket indexes are sometimes cached forever instead of with the expected TTL. #8343
[BUGFIX] OTLP handler: fix errors returned by OTLP handler when used via httpgrpc tunneling. #8363
[BUGFIX] Update github.com/hashicorp/go-retryablehttp to address CVE-2024-6104. #8539
[BUGFIX] Alertmanager: Fixes a number of bugs in silences which could cause an existing silence to be deleted/expired when updating the silence failed. This could happen when the replacing silence was invalid or exceeded limits. #8525
[BUGFIX] Alertmanager: Fix per-tenant silence limits not reloaded during runtime. #8456
[BUGFIX] Alertmanager: Fix help message for utf-8-strict-mode. #8572
[BUGFIX] Upgrade golang to 1.22.5 to address CVE-2024-24791. #8600

Mixin

[CHANGE] Alerts: Removed obsolete MimirQueriesIncorrect alert that used test-exporter metrics. Test-exporter support was however removed in Mimir 2.0 release. #7774
[CHANGE] Alerts: Change threshold for MimirBucketIndexNotUpdated alert to fire before queries begin to fail due to bucket index age. #7879
[FEATURE] Dashboards: added 'Remote ruler reads networking' dashboard. #7751
[FEATURE] Alerts: Add MimirIngesterStuckProcessingRecordsFromKafka alert. #8147
[ENHANCEMENT] Alerts: allow configuring alerts range interval via _config.base_alerts_range_interval_minutes. #7591
[ENHANCEMENT] Dashboards: Add panels for monitoring distributor and ingester when using ingest-storage. These panels are disabled by default, but can be enabled using show_ingest_storage_panels: true config option. Similarly existing panels used when distributors and ingesters use gRPC for forwarding requests can be disabled by setting show_grpc_ingestion_panels: false. #7670 #7699
[ENHANCEMENT] Alerts: add the following alerts when using ingest-storage: #7699 #7702 #7867
- MimirIngesterLastConsumedOffsetCommitFailed
- MimirIngesterFailedToReadRecordsFromKafka
- MimirIngesterKafkaFetchErrorsRateTooHigh
- MimirStartingIngesterKafkaReceiveDelayIncreasing
- MimirRunningIngesterReceiveDelayTooHigh
- MimirIngesterFailsToProcessRecordsFromKafka
- MimirIngesterFailsEnforceStrongConsistencyOnReadPath
[ENHANCEMENT] Dashboards: add in-flight queries scaling metric panel for ruler-querier. #7749
[ENHANCEMENT] Dashboards: renamed rows in the "Remote ruler reads" and "Remote ruler reads resources" dashboards to match the actual component names. #7750
[ENHANCEMENT] Dashboards: allow switching between using classic of native histograms in dashboards. #7627
- Overview dashboard, Status panel, cortex_request_duration_seconds metric.
[ENHANCEMENT] Alerts: exclude 529 and 598 status codes from failure codes in MimirRequestsError. #7889
[ENHANCEMENT] Dashboards: renamed "TCP Connections" panel to "Ingress TCP Connections" in the networking dashboards. #8092
[ENHANCEMENT] Dashboards: update the use of deprecated "table (old)" panels to "table". #8181
[ENHANCEMENT] Dashboards: added a component variable to "Slow queries" dashboard to allow checking the slow queries of the remote ruler evaluation query path. #8309
[BUGFIX] Dashboards: fix regular expression for matching read-path gRPC ingester methods to include querying of exemplars, label-related queries, or active series queries. #7676
[BUGFIX] Dashboards: fix user id abbreviations and column heads for Top Tenants dashboard. #7724
[BUGFIX] Dashboards: fix incorrect query used for "queue length" panel on "Ruler" dashboard. #8006
[BUGFIX] Dashboards: fix disk space utilization panels when running with a recent version of kube-state-metrics. #8212

Jsonnet

[CHANGE] Memcached: Change default read timeout for chunks and index caches to 750ms from 450ms. #7778
[CHANGE] Fine-tuned terminationGracePeriodSeconds for the following components: #7364
- Querier: changed from 30 to 180
- Query-scheduler: changed from 30 to 180
[CHANGE] Change TCP port exposed by mimir-continuous-test deployment to match with updated defaults of its container image (see changes below). #7958
[FEATURE] Add support to deploy Mimir with experimental ingest storage enabled. #8028 #8222
[ENHANCEMENT] Compactor: add $._config.cortex_compactor_concurrent_rollout_enabled option (disabled by default) that makes use of rollout-operator to speed up the rollout of compactors. #7783 #7878
[ENHANCEMENT] Shuffle-sharding: add $._config.shuffle_sharding.ingest_storage_partitions_enabled and $._config.shuffle_sharding.ingester_partitions_shard_size options, that allow configuring partitions shard size in ingest-storage mode. #7804
[ENHANCEMENT] Update rollout-operator to v0.17.0. #8399
[ENHANCEMENT] Add _config.autoscaling_querier_predictive_scaling_enabled to scale querier based on inflight queries 7 days ago. #7775
[ENHANCEMENT] Add support to autoscale ruler-querier replicas based on in-flight queries too (in addition to CPU and memory based scaling). #8060 #8188
[ENHANCEMENT] Distributor: improved distributor HPA scaling metric to only take in account ready pods. This requires the metric kube_pod_status_ready to be available in the data source used by KEDA to query scaling metrics (configured via _config.autoscaling_prometheus_url). #8251
[BUGFIX] Guard against missing samples in KEDA queries. #7691
[BUGFIX] Alertmanager: Set -server.http-idle-timeout to avoid EOF errors in ruler. #8192

Mimirtool

[CHANGE] Deprecated --rule-files flag in favor of CLI arguments. #7756
[FEATURE] mimirtool: Add runtime-config verify sub-command, for verifying Mimir runtime config files. #8123
[ENHANCEMENT] mimirtool promql format: Format PromQL query with Prometheus' string or pretty-print formatter. #7742
[ENHANCEMENT] Add mimir-http-prefix configuration to set the Mimir URL prefix when using legacy routes. #8069
[ENHANCEMENT] Add option --output-dir to mimirtool rules get and mimirtool rules print to allow persisting rule groups to a file for edit and re-upload. #8142
[BUGFIX] Fix panic in loadgen subcommand. #7629
[BUGFIX] mimirtool rules prepare: do not add aggregation label to on() clause if already present in group_left() or group_right(). #7839
[BUGFIX] Analyze Grafana: fix parsing queries with variables. #8062
[BUGFIX] mimirtool rules sync: detect a change when the query_offset or the deprecated evaluation_delay configuration changes. #8297

Mimir Continuous Test

[CHANGE] mimir-continuous-test has been deprecated and replaced by a Mimir module that can be run as a target from the mimir binary using mimir -target=continuous-test. #7753
[CHANGE] -server.metrics-port flag is no longer available for use in the module run of mimir-continuous-test, including the grafana/mimir-continuous-test Docker image which uses the new module. Configuring this port is still possible in the binary, which is deprecated. #7747
[CHANGE] Allowed authenticatication to Mimir using both Tenant ID and basic/bearer auth #7619.
[BUGFIX] Set User-Agent header for all requests sent from the testing client. #7607

Query-tee

[ENHANCEMENT] Log queries that take longer than proxy.log-slow-query-response-threshold when compared to other backends. #7346
[ENHANCEMENT] Add two new metrics for measuring the relative duration between backends: #7782 #8013 #8330
- cortex_querytee_backend_response_relative_duration_seconds
- cortex_querytee_backend_response_relative_duration_proportional

Documentation

[ENHANCEMENT] Clarify Compactor and its storage volume when configured under Kubernetes. #7675
[ENHANCEMENT] Add OTLP route to Mimir routes by path runbooks section. #8074
[ENHANCEMENT] Document option server.log-source-ips-full. #8268

Tools

[ENHANCEMENT] ulidtime: add option to show random part of ULID, timestamp in milliseconds and header. #7615
[ENHANCEMENT] copyblocks: add a flag to configure part-size for multipart uploads in s3 client-side copying. #8292
[ENHANCEMENT] copyblocks: enable pprof HTTP endpoints. #8292

2.12.0

Grafana Mimir

[CHANGE] Alertmanager: Deprecates the v1 API. All v1 API endpoints now respond with a JSON deprecation notice and a status code of 410. All endpoints have a v2 equivalent. The list of endpoints is: #7103
- <alertmanager-web.external-url>/api/v1/alerts
- <alertmanager-web.external-url>/api/v1/receivers
- <alertmanager-web.external-url>/api/v1/silence/{id}
- <alertmanager-web.external-url>/api/v1/silences
- <alertmanager-web.external-url>/api/v1/status
[CHANGE] Ingester: Increase default value of -blocks-storage.tsdb.head-postings-for-matchers-cache-max-bytes and -blocks-storage.tsdb.block-postings-for-matchers-cache-max-bytes to 100 MiB (previous default value was 10 MiB). #6764
[CHANGE] Validate tenant IDs according to documented behavior even when tenant federation is not enabled. Note that this will cause some previously accepted tenant IDs to be rejected such as those longer than 150 bytes or containing | characters. #6959
[CHANGE] Ruler: don't use backoff retry on remote evaluation in case of 4xx errors. #7004
[CHANGE] Server: responses with HTTP 4xx status codes are now treated as errors and used in status_code label of request duration metric. #7045
[CHANGE] Memberlist: change default for -memberlist.stream-timeout from 10s to 2s. #7076
[CHANGE] Memcached: remove legacy thanos_cache_memcached_* and thanos_memcached_* prefixed metrics. Instead, Memcached and Redis cache clients now emit thanos_cache_* prefixed metrics with a backend label. #7076
[CHANGE] Ruler: the following metrics, exposed when the ruler is configured to discover Alertmanager instances via service discovery, have been renamed: #7057
- prometheus_sd_failed_configs renamed to cortex_prometheus_sd_failed_configs
- prometheus_sd_discovered_targets renamed to cortex_prometheus_sd_discovered_targets
- prometheus_sd_received_updates_total renamed to cortex_prometheus_sd_received_updates_total
- prometheus_sd_updates_delayed_total renamed to cortex_prometheus_sd_updates_delayed_total
- prometheus_sd_updates_total renamed to cortex_prometheus_sd_updates_total
- prometheus_sd_refresh_failures_total renamed to cortex_prometheus_sd_refresh_failures_total
- prometheus_sd_refresh_duration_seconds renamed to cortex_prometheus_sd_refresh_duration_seconds
[CHANGE] Query-frontend: the default value for -query-frontend.not-running-timeout has been changed from 0 (disabled) to 2s. The configuration option has also been moved from "experimental" to "advanced". #7127
[CHANGE] Store-gateway: to reduce disk contention on HDDs the default value for blocks-storage.bucket-store.tenant-sync-concurrency has been changed from 10 to 1 and the default value for blocks-storage.bucket-store.block-sync-concurrency has been changed from 20 to 4. #7136
[CHANGE] Store-gateway: Remove deprecated CLI flags -blocks-storage.bucket-store.index-header-lazy-loading-enabled and -blocks-storage.bucket-store.index-header-lazy-loading-idle-timeout and their corresponding YAML settings. Instead, use -blocks-storage.bucket-store.index-header.lazy-loading-enabled and -blocks-storage.bucket-store.index-header.lazy-loading-idle-timeout. #7521
[CHANGE] Store-gateway: Mark experimental CLI flag -blocks-storage.bucket-store.index-header.lazy-loading-concurrency and its corresponding YAML settings as advanced. #7521
[CHANGE] Store-gateway: Remove experimental CLI flag -blocks-storage.bucket-store.index-header.sparse-persistence-enabled since this is now the default behavior. #7535
[CHANGE] All: set -server.report-grpc-codes-in-instrumentation-label-enabled to true by default, which enables reporting gRPC status codes as status_code labels in the cortex_request_duration_seconds metric. #7144
[CHANGE] Distributor: report gRPC status codes as status_code labels in the cortex_ingester_client_request_duration_seconds metric by default. #7144
[CHANGE] Distributor: CLI flag -ingester.client.report-grpc-codes-in-instrumentation-label-enabled has been deprecated, and its default value is set to true. #7144
[CHANGE] Ingester: CLI flag -ingester.return-only-grpc-errors has been deprecated, and its default value is set to true. To ensure backwards compatibility, during a migration from a version prior to 2.11.0 to 2.12 or later, -ingester.return-only-grpc-errors should be set to false. Once all the components are migrated, the flag can be removed. #7151
[CHANGE] Ingester: the following CLI flags have been moved from "experimental" to "advanced": #7169
- -ingester.ring.token-generation-strategy
- -ingester.ring.spread-minimizing-zones
- -ingester.ring.spread-minimizing-join-ring-in-order
[CHANGE] Query-frontend: the default value of the CLI flag -query-frontend.max-cache-freshness (and its respective YAML configuration parameter) has been changed from 1m to 10m. #7161
[CHANGE] Distributor: default the optimization -distributor.write-requests-buffer-pooling-enabled to true. #7165
[CHANGE] Tracing: Move query information to span attributes instead of span logs. #7046
[CHANGE] Distributor: the default value of circuit breaker's CLI flag -ingester.client.circuit-breaker.cooldown-period has been changed from 1m to 10s. #7310
[CHANGE] Store-gateway: remove cortex_bucket_store_blocks_loaded_by_duration. cortex_bucket_store_series_blocks_queried is better suited for detecting when compactors are not able to keep up with the number of blocks to compact. #7309
[CHANGE] Ingester, Distributor: the support for rejecting push requests received via gRPC before reading them into memory, enabled via -ingester.limit-inflight-requests-using-grpc-method-limiter and -distributor.limit-inflight-requests-using-grpc-method-limiter, is now stable and enabled by default. The configuration options have been deprecated and will be removed in Mimir 2.14. #7360
[CHANGE] Distributor: Change-distributor.enable-otlp-metadata-storage flag's default to true, and deprecate it. The flag will be removed in Mimir 2.14. #7366
[CHANGE] Store-gateway: Use a shorter TTL for cached items related to temporary blocks. #7407 #7534
[CHANGE] Standardise exemplar label as "trace_id". #7475
[CHANGE] The configuration option -querier.max-query-into-future has been deprecated and will be removed in Mimir 2.14. #7496
[CHANGE] Distributor: the metric cortex_distributor_sample_delay_seconds has been deprecated and will be removed in Mimir 2.14. #7516
[CHANGE] Query-frontend: The deprecated YAML setting frontend.cache_unaligned_requests has been moved to limits.cache_unaligned_requests. #7519
[CHANGE] Querier: the CLI flag -querier.minimize-ingester-requests has been moved from "experimental" to "advanced". #7638
[CHANGE] Ingester: allow only POST method on /ingester/shutdown, as previously it was too easy to accidentally trigger through GET requests. At the same time, add an option to keep the existing behavior by introducing an -api.get-request-for-ingester-shutdown-enabled flag. This flag will be removed in Mimir 2.15. #7707
[FEATURE] Introduce -server.log-source-ips-full option to log all IPs from Forwarded, X-Real-IP, X-Forwarded-For headers. #7250
[FEATURE] Introduce -tenant-federation.max-tenants option to limit the max number of tenants allowed for requests when federation is enabled. #6959
[FEATURE] Cardinality API: added a new count_method parameter which enables counting active label names. #7085
[FEATURE] Querier / query-frontend: added -querier.promql-experimental-functions-enabled CLI flag (and respective YAML config option) to enable experimental PromQL functions. The experimental functions introduced are: mad_over_time(), sort_by_label() and sort_by_label_desc(). #7057
[FEATURE] Alertmanager API: added -alertmanager.grafana-alertmanager-compatibility-enabled CLI flag (and respective YAML config option) to enable an experimental API endpoints that support the migration of the Grafana Alertmanager. #7057
[FEATURE] Alertmanager: Added -alertmanager.utf8-strict-mode-enabled to control support for any UTF-8 character as part of Alertmanager configuration/API matchers and labels. It's default value is set to false. #6898
[FEATURE] Querier: added histogram_avg() function support to PromQL. #7293
[FEATURE] Ingester: added -blocks-storage.tsdb.timely-head-compaction flag, which enables more timely head compaction, and defaults to false. #7372
[FEATURE] Compactor: Added /compactor/tenants and /compactor/tenant/{tenant}/planned_jobs endpoints that provide functionality that was provided by tools/compaction-planner -- listing of planned compaction jobs based on tenants' bucket index. #7381
[FEATURE] Add experimental support for streaming response bodies from queriers to frontends via -querier.response-streaming-enabled. This is currently only supported for the /api/v1/cardinality/active_series endpoint. #7173
[FEATURE] Release: Added mimir distroless docker image. #7371
[FEATURE] Add support for the new grammar of {"metric_name", "l1"="val"} to promql and some of the exposition formats. #7475 #7541
[ENHANCEMENT] Distributor: Add a new metric cortex_distributor_otlp_requests_total to track the total number of OTLP requests. #7385
[ENHANCEMENT] Vault: add lifecycle manager for token used to authenticate to Vault. This ensures the client token is always valid. Includes a gauge (cortex_vault_token_lease_renewal_active) to check whether token renewal is active, and the counters cortex_vault_token_lease_renewal_success_total and cortex_vault_auth_success_total to see the total number of successful lease renewals / authentications. #7337
[ENHANCEMENT] Store-gateway: add no-compact details column on store-gateway tenants admin UI. #6848
[ENHANCEMENT] PromQL: ignore small errors for bucketQuantile #6766
[ENHANCEMENT] Distributor: improve efficiency of some errors #6785
[ENHANCEMENT] Ruler: exclude vector queries from being tracked in cortex_ruler_queries_zero_fetched_series_total. #6544
[ENHANCEMENT] Ruler: local storage backend now supports reading a rule group via /config/api/v1/rules/{namespace}/{groupName} configuration API endpoint. #6632
[ENHANCEMENT] Query-Frontend and Query-Scheduler: split tenant query request queues by query component with query-frontend.additional-query-queue-dimensions-enabled and query-scheduler.additional-query-queue-dimensions-enabled. #6772
[ENHANCEMENT] Distributor: support disabling metric relabel rules per-tenant via the flag -distributor.metric-relabeling-enabled or associated YAML. #6970
[ENHANCEMENT] Distributor: -distributor.remote-timeout is now accounted from the first ingester push request being sent. #6972
[ENHANCEMENT] Storage Provider: -<prefix>.s3.sts-endpoint sets a custom endpoint for AWS Security Token Service (AWS STS) in s3 storage provider. #6172
[ENHANCEMENT] Querier: add cortex_querier_queries_storage_type_total metric that indicates how many queries have executed for a source, ingesters or store-gateways. Add cortex_querier_query_storegateway_chunks_total metric to count the number of chunks fetched from a store gateway. #7099,#7145
[ENHANCEMENT] Query-frontend: add experimental support for sharding active series queries via -query-frontend.shard-active-series-queries. #6784
[ENHANCEMENT] Distributor: set -distributor.reusable-ingester-push-workers=2000 by default and mark feature as advanced. #7128
[ENHANCEMENT] All: set -server.grpc.num-workers=100 by default and mark feature as advanced. #7131
[ENHANCEMENT] Distributor: invalid metric name error message gets cleaned up to not include non-ascii strings. #7146
[ENHANCEMENT] Store-gateway: add source, level, and out_or_order to cortex_bucket_store_series_blocks_queried metric that indicates the number of blocks that were queried from store gateways by block metadata. #7112 #7262 #7267
[ENHANCEMENT] Compactor: After updating bucket-index, compactor now also computes estimated number of compaction jobs based on current bucket-index, and reports the result in cortex_bucket_index_estimated_compaction_jobs metric. If computation of jobs fails, cortex_bucket_index_estimated_compaction_jobs_errors_total is updated instead. #7299
[ENHANCEMENT] Mimir: Integrate profiling into tracing instrumentation. #7363
[ENHANCEMENT] Alertmanager: Adds metric cortex_alertmanager_notifications_suppressed_total that counts the total number of notifications suppressed for being silenced, inhibited, outside of active time intervals or within muted time intervals. #7384
[ENHANCEMENT] Query-scheduler: added more buckets to cortex_query_scheduler_queue_duration_seconds histogram metric, in order to better track queries staying in the queue for longer than 10s. #7470
[ENHANCEMENT] A type label is added to prometheus_tsdb_head_out_of_order_samples_appended_total metric. #7475
[ENHANCEMENT] Distributor: Optimize OTLP endpoint. #7475
[ENHANCEMENT] API: Use github.com/klauspost/compress for faster gzip and deflate compression of API responses. #7475
[ENHANCEMENT] Ingester: Limiting on owned series (-ingester.use-ingester-owned-series-for-limits) now prevents discards in cases where a tenant is sharded across all ingesters (or shuffle sharding is disabled) and the ingester count increases. #7411
[ENHANCEMENT] Block upload: include converted timestamps in the error message if block is from the future. #7538
[ENHANCEMENT] Query-frontend: Introduce -query-frontend.active-series-write-timeout to allow configuring the server-side write timeout for active series requests. #7553 #7569
[BUGFIX] Ingester: don't ignore errors encountered while iterating through chunks or samples in response to a query request. #6451
[BUGFIX] Fix issue where queries can fail or omit OOO samples if OOO head compaction occurs between creating a querier and reading chunks #6766
[BUGFIX] Fix issue where concatenatingChunkIterator can obscure errors #6766
[BUGFIX] Fix panic during tsdb Commit #6766
[BUGFIX] tsdb/head: wlog exemplars after samples #6766
[BUGFIX] Ruler: fix issue where "failed to remotely evaluate query expression, will retry" messages are logged without context such as the trace ID and do not appear in trace events. #6789
[BUGFIX] Ruler: do not retry requests to remote querier when server's response exceeds its configured max payload size. #7216
[BUGFIX] Querier: fix issue where spans in query request traces were not nested correctly. #6893
[BUGFIX] Fix issue where all incoming HTTP requests have duplicate trace spans. #6920
[BUGFIX] Querier: do not retry requests to store-gateway when a query gets canceled. #6934
[BUGFIX] Querier: return 499 status code instead of 500 when a request to remote read endpoint gets canceled. #6934
[BUGFIX] Querier: fix issue where -querier.max-fetched-series-per-query is not applied to /series endpoint if the series are loaded from ingesters. #7055
[BUGFIX] Distributor: fix issue where -distributor.metric-relabeling-enabled may cause distributors to panic #7176
[BUGFIX] Distributor: fix issue where -distributor.metric-relabeling-enabled may cause distributors to write unsorted labels and corrupt blocks #7326
[BUGFIX] Query-frontend: the cortex_query_frontend_queries_total report incorrectly reported op="query" for any request which wasn't a range query. Now the op label value can be one of the following: #7207
- query: instant query
- query_range: range query
- cardinality: cardinality query
- label_names_and_values: label names / values query
- active_series: active series query
- other: any other request
[BUGFIX] Fix performance regression introduced in Mimir 2.11.0 when uploading blocks to AWS S3. #7240
[BUGFIX] Query-frontend: fix race condition when sharding active series is enabled (see above) and response is compressed with snappy. #7290
[BUGFIX] Query-frontend: "query stats" log unsuccessful replies from downstream as "failed". #7296
[BUGFIX] Packaging: remove reload from systemd file as mimir does not take into account SIGHUP. #7345
[BUGFIX] Compactor: do not allow out-of-order blocks to prevent timely compaction. #7342
[BUGFIX] Update google.golang.org/grpc to resolve occasional issues with gRPC server closing its side of connection before it was drained by the client. #7380
[BUGFIX] Query-frontend: abort response streaming for active_series requests when the request context is canceled. #7378
[BUGFIX] Compactor: improve compaction of sporadic blocks. #7329
[BUGFIX] Ruler: fix regression that caused client errors to be tracked in cortex_ruler_write_requests_failed_total metric. #7472
[BUGFIX] promql: Fix Range selectors with an @ modifier are wrongly scoped in range queries. #7475
[BUGFIX] Fix metadata API using wrong JSON field names. #7475
[BUGFIX] Ruler: fix native histogram recording rule result corruption. #7552
[BUGFIX] Querier: fix HTTP status code translations for remote read requests. Previously, remote-read had conflicting behaviours: when returning samples all internal errors were translated to HTTP 400; when returning chunks all internal errors were translated to HTTP 500. #7487
[BUGFIX] Query-frontend: Fix memory leak on every request. #7654

Mixin

[CHANGE] The job label matcher for distributor and gateway have been extended to include any deployment matching distributor.* and cortex-gw.* respectively. This change allows to match custom and multi-zone distributor and gateway deployments too. #6817
[ENHANCEMENT] Dashboards: Add panels for alertmanager activity of a tenant #6826
[ENHANCEMENT] Dashboards: Add graphs to "Slow Queries" dashboard. #6880
[ENHANCEMENT] Dashboards: Update all deprecated "graph" panels to "timeseries" panels. #6864 #7413 #7457
[ENHANCEMENT] Dashboards: Make most columns in "Slow Queries" sortable. #7000
[ENHANCEMENT] Dashboards: Render graph panels at full resolution as opposed to at half resolution. #7027
[ENHANCEMENT] Dashboards: show query-scheduler queue length on "Reads" and "Remote Ruler Reads" dashboards. #7088
[ENHANCEMENT] Dashboards: Add estimated number of compaction jobs to "Compactor", "Tenants" and "Top tenants" dashboards. #7449 #7481
[ENHANCEMENT] Recording rules: add native histogram recording rules to cortex_request_duration_seconds. #7528
[ENHANCEMENT] Dashboards: Add total owned series, and per-ingester in-memory and owned series to "Tenants" dashboard. #7511
[BUGFIX] Dashboards: drop step parameter from targets as it is not supported. #7157
[BUGFIX] Recording rules: drop rules for metrics removed in 2.0: cortex_memcache_request_duration_seconds and cortex_cache_request_duration_seconds. #7514

Jsonnet

[CHANGE] Distributor: Increase JAEGER_REPORTER_MAX_QUEUE_SIZE from the default (100) to 1000, to avoid dropping tracing spans. #7259
[CHANGE] Querier: Increase JAEGER_REPORTER_MAX_QUEUE_SIZE from 1000 to 5000, to avoid dropping tracing spans. #6764
[CHANGE] rollout-operator: remove default CPU limit. #7066
[CHANGE] Store-gateway: Increase JAEGER_REPORTER_MAX_QUEUE_SIZE from the default (100) to 1000, to avoid dropping tracing spans. #7068
[CHANGE] Query-frontend, ingester, ruler, backend and write instances: Increase JAEGER_REPORTER_MAX_QUEUE_SIZE from the default (100), to avoid dropping tracing spans. #7086
[CHANGE] Ring: relaxed the hash ring heartbeat period and timeout for distributor, ingester, store-gateway and compactor: #6860
- -distributor.ring.heartbeat-period set to 1m
- -distributor.ring.heartbeat-timeout set to 4m
- -ingester.ring.heartbeat-period set to 2m
- -store-gateway.sharding-ring.heartbeat-period set to 1m
- -store-gateway.sharding-ring.heartbeat-timeout set to 4m
- -compactor.ring.heartbeat-period set to 1m
- -compactor.ring.heartbeat-timeout set to 4m
[CHANGE] Ruler-querier: the topology spread constrain max skew is now configured through the configuration option ruler_querier_topology_spread_max_skew instead of querier_topology_spread_max_skew. #7204
[CHANGE] Distributor: -server.grpc.keepalive.max-connection-age lowered from 2m to 60s and configured -shutdown-delay=90s and termination grace period to 100 seconds in order to reduce the chances of failed gRPC write requests when distributors gracefully shutdown. #7361
[FEATURE] Added support for the following root-level settings to configure the list of matchers to apply to node affinity: #6782 #6829
- alertmanager_node_affinity_matchers
- compactor_node_affinity_matchers
- continuous_test_node_affinity_matchers
- distributor_node_affinity_matchers
- ingester_node_affinity_matchers
- ingester_zone_a_node_affinity_matchers
- ingester_zone_b_node_affinity_matchers
- ingester_zone_c_node_affinity_matchers
- mimir_backend_node_affinity_matchers
- mimir_backend_zone_a_node_affinity_matchers
- mimir_backend_zone_b_node_affinity_matchers
- mimir_backend_zone_c_node_affinity_matchers
- mimir_read_node_affinity_matchers
- mimir_write_node_affinity_matchers
- mimir_write_zone_a_node_affinity_matchers
- mimir_write_zone_b_node_affinity_matchers
- mimir_write_zone_c_node_affinity_matchers
- overrides_exporter_node_affinity_matchers
- querier_node_affinity_matchers
- query_frontend_node_affinity_matchers
- query_scheduler_node_affinity_matchers
- rollout_operator_node_affinity_matchers
- ruler_node_affinity_matchers
- ruler_node_affinity_matchers
- ruler_querier_node_affinity_matchers
- ruler_query_frontend_node_affinity_matchers
- ruler_query_scheduler_node_affinity_matchers
- store_gateway_node_affinity_matchers
- store_gateway_node_affinity_matchers
- store_gateway_zone_a_node_affinity_matchers
- store_gateway_zone_b_node_affinity_matchers
- store_gateway_zone_c_node_affinity_matchers
[FEATURE] Ingester: Allow automated zone-by-zone downscaling, that can be enabled via the ingester_automated_downscale_enabled flag. It is disabled by default. #6850
[ENHANCEMENT] Alerts: Add MimirStoreGatewayTooManyFailedOperations warning alert that triggers when Mimir store-gateway report error when interacting with the object storage. #6831
[ENHANCEMENT] Querier HPA: improved scaling metric and scaling policies, in order to scale up and down more gradually. #6971
[ENHANCEMENT] Rollout-operator: upgraded to v0.13.0. #7469
[ENHANCEMENT] Rollout-operator: add tracing configuration to rollout-operator container (when tracing is enabled and configured). #7469
[ENHANCEMENT] Query-frontend: configured -shutdown-delay, -server.grpc.keepalive.max-connection-age and termination grace period to reduce the likelihood of queries hitting terminated query-frontends. #7129
[ENHANCEMENT] Autoscaling: add support for KEDA's ignoreNullValues option for Prometheus scaler. #7471
[BUGFIX] Update memcached-exporter to 0.14.1 due to CVE-2023-39325. #6861

Mimirtool

[FEATURE] Add command migrate-utf8 to migrate Alertmanager configurations for Alertmanager versions 0.27.0 and later. #7383
[ENHANCEMENT] Add template render command to render locally a template. #7325
[ENHANCEMENT] Add --extra-headers option to mimirtool rules command to add extra headers to requests for auth. #7141
[ENHANCEMENT] Analyze Prometheus: set tenant header. #6737
[ENHANCEMENT] Add argument --output-dir to mimirtool alertmanager get where the config and templates will be written to and can be loaded via mimirtool alertmanager load #6760
[BUGFIX] Analyze rule-file: .metricsUsed field wasn't populated. #6953

Mimir Continuous Test

[ENHANCEMENT] Include comparison of all expected and actual values when any float sample does not match. #6756

Query-tee

[BUGFIX] Fix issue where Host HTTP header was not being correctly changed for the proxy targets. #7386
[ENHANCEMENT] Allow using the value of X-Scope-OrgID for basic auth username in the forwarded request if URL username is set as __REQUEST_HEADER_X_SCOPE_ORGID__. #7452

Documentation

[CHANGE] No longer mark OTLP distributor endpoint as experimental. #7348
[ENHANCEMENT] Added runbook for KubePersistentVolumeFillingUp alert. #7297
[ENHANCEMENT] Add Grafana Cloud recommendations to OTLP documentation. #7375
[BUGFIX] Fixed typo on single zone->zone aware replication Helm page. #7327

Tools

[CHANGE] copyblocks: The flags for copyblocks have been changed to align more closely with other tools. #6607
[CHANGE] undelete-blocks: undelete-blocks-gcs has been removed and replaced with undelete-blocks, which supports recovering deleted blocks in versioned buckets from ABS, GCS, and S3-compatible object storage. #6607
[FEATURE] copyprefix: Add tool to copy objects between prefixes. Supports ABS, GCS, and S3-compatible object storage. #6607

2.11.0

Grafana Mimir

[CHANGE] The following deprecated configurations have been removed: #6673 #6779 #6808 #6814
- -querier.iterators
- -querier.batch-iterators
- -blocks-storage.bucket-store.max-chunk-pool-bytes
- -blocks-storage.bucket-store.chunk-pool-min-bucket-size-bytes
- -blocks-storage.bucket-store.chunk-pool-max-bucket-size-bytes
- -blocks-storage.bucket-store.bucket-index.enabled
[CHANGE] Querier: Split worker GRPC config into separate client configs for the frontend and scheduler to allow TLS to be configured correctly when specifying the tls_server_name. The GRPC config specified under -querier.frontend-client.* will no longer apply to the scheduler client, and will need to be set explicitly under -querier.scheduler-client.*. #6445 #6573
[CHANGE] Store-gateway: enable sparse index headers by default. Sparse index headers reduce the time to load an index header up to 90%. #6005
[CHANGE] Store-gateway: lazy-loading concurrency limit default value is now 4. #6004
[CHANGE] General: enabled -log.buffered by default. The -log.buffered has been deprecated and will be removed in Mimir 2.13. #6131
[CHANGE] Ingester: changed default -blocks-storage.tsdb.series-hash-cache-max-size-bytes setting from 1GB to 350MB. The new default cache size is enough to store the hashes for all series in a ingester, assuming up to 2M in-memory series per ingester and using the default 13h retention period for local TSDB blocks in the ingesters. #6130
[CHANGE] Query-frontend: removed cortex_query_frontend_workers_enqueued_requests_total. Use cortex_query_frontend_enqueue_duration_seconds_count instead. #6121
[CHANGE] Ingester / querier: enable ingester to querier chunks streaming by default and mark it as stable. #6174
[CHANGE] Ingester / querier: enable ingester query request minimisation by default and mark it as stable. #6174
[CHANGE] Ingester: changed the default value for the experimental configuration parameter -blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage from 10 to 15. #6186
[CHANGE] Ingester: /ingester/push HTTP endpoint has been removed. This endpoint was added for testing and troubleshooting, but was never documented or used for anything. #6299
[CHANGE] Experimental setting -log.rate-limit-logs-per-second-burst renamed to -log.rate-limit-logs-burst-size. #6230
[CHANGE] Ingester: by setting the newly introduced experimental CLI flag -ingester.return-only-grpc-errors to true, ingester will return only gRPC errors. #6443 #6680 #6723
[CHANGE] Upgrade Node.js to v20. #6540
[CHANGE] Querier: cortex_querier_blocks_consistency_checks_failed_total is now incremented when a block couldn't be queried from any attempted store-gateway as opposed to incremented after each attempt. Also cortex_querier_blocks_consistency_checks_total is incremented once per query as opposed to once per attempt (with 3 attempts). #6590
[CHANGE] Ingester: Modify utilization based read path limiter to base memory usage on Go heap size. #6584
[FEATURE] Distributor: added option -distributor.retry-after-header.enabled to include the Retry-After header in recoverable error responses. #6608
[FEATURE] Query-frontend: add experimental support for query blocking. Queries are blocked on a per-tenant basis and is configured via the limit blocked_queries. #5609
[FEATURE] Vault: Added support for new Vault authentication methods: AppRole, Kubernetes, UserPass and Token. #6143
[FEATURE] Add experimental endpoint /api/v1/cardinality/active_series to return the set of active series for a given selector. #6536 #6619 #6651 #6667 #6717
[FEATURE] Added -<prefix>.s3.part-size flag to configure the S3 minimum file size in bytes used for multipart uploads. #6592
[FEATURE] Add the experimental -<prefix>.s3.send-content-md5 flag (defaults to false) to configure S3 Put Object requests to send a Content-MD5 header. Setting this flag is not recommended unless your object storage does not support checksums. #6622
[FEATURE] Distributor: add an experimental flag -distributor.reusable-ingester-push-worker that can be used to pre-allocate a pool of workers to be used to send push requests to the ingesters. #6660
[FEATURE] Distributor: Support enabling of automatically generated name suffixes for metrics ingested via OTLP, through the flag -distributor.otel-metric-suffixes-enabled. #6542
[FEATURE] Ingester: ingester can now track which of the user's series the ingester actually owns according to the ring, and only consider owned series when checking for user series limit. This helps to avoid hitting the user's series limit when scaling up ingesters or changing user's ingester shard size. Feature is currently experimental, and disabled by default. It can be enabled by setting -ingester.use-ingester-owned-series-for-limits (to use owned series for limiting). This is currently limited to multi-zone ingester setup, with replication factor being equal to number of zones. #6718 #7087
[ENHANCEMENT] Query-frontend: don't treat cancel as an error. #4648
[ENHANCEMENT] Ingester: exported summary cortex_ingester_inflight_push_requests_summary tracking total number of inflight requests in percentile buckets. #5845
[ENHANCEMENT] Query-scheduler: add cortex_query_scheduler_enqueue_duration_seconds metric that records the time taken to enqueue or reject a query request. #5879
[ENHANCEMENT] Query-frontend: add cortex_query_frontend_enqueue_duration_seconds metric that records the time taken to enqueue or reject a query request. When query-scheduler is in use, the metric has the scheduler_address label to differentiate the enqueue duration by query-scheduler backend. #5879 #6087 #6120
[ENHANCEMENT] Store-gateway: add metric cortex_bucket_store_blocks_loaded_by_duration for counting the loaded number of blocks based on their duration. #6074 #6129
[ENHANCEMENT] Expose /sync/mutex/wait/total:seconds Go runtime metric as go_sync_mutex_wait_total_seconds_total from all components. #5879
[ENHANCEMENT] Query-scheduler: improve latency with many concurrent queriers. #5880
[ENHANCEMENT] Ruler: add new per-tenant cortex_ruler_queries_zero_fetched_series_total metric to track rules that fetched no series. #5925
[ENHANCEMENT] Implement support for limit, limit_per_metric and metric parameters for <Prometheus HTTP prefix>/api/v1/metadata endpoint. #5890
[ENHANCEMENT] Distributor: add experimental support for storing metadata when ingesting metrics via OTLP. This makes metrics description and type available when ingesting metrics via OTLP. Enable with -distributor.enable-otlp-metadata-storage=true. #5693 #6035 #6254
[ENHANCEMENT] Ingester: added support for sampling errors, which can be enabled by setting -ingester.error-sample-rate. This way each error will be logged once in the configured number of times. All the discarded samples will still be tracked by the cortex_discarded_samples_total metric. #5584 #6014
[ENHANCEMENT] Ruler: Fetch secrets used to configure TLS on the Alertmanager client from Vault when -vault.enabled is true. #5239
[ENHANCEMENT] Query-frontend: added query-sharding support for group by aggregation queries. #6024
[ENHANCEMENT] Fetch secrets used to configure server-side TLS from Vault when -vault.enabled is true. #6052.
[ENHANCEMENT] Packaging: add logrotate config file. #6142
[ENHANCEMENT] Ingester: add the experimental configuration options -blocks-storage.tsdb.head-postings-for-matchers-cache-max-bytes and -blocks-storage.tsdb.block-postings-for-matchers-cache-max-bytes to enforce a limit in bytes on the PostingsForMatchers() cache used by ingesters (the cache limit is per TSDB head and block basis, not a global one). The experimental configuration options -blocks-storage.tsdb.head-postings-for-matchers-cache-size and -blocks-storage.tsdb.block-postings-for-matchers-cache-size have been deprecated. #6151
[ENHANCEMENT] Ingester: use the PostingsForMatchers() in-memory cache for label values queries with matchers too. #6151
[ENHANCEMENT] Ingester / store-gateway: optimized regex matchers. #6168 #6250
[ENHANCEMENT] Distributor: Include ingester IDs in circuit breaker related metrics and logs. #6206
[ENHANCEMENT] Querier: improve errors and logging when streaming chunks from ingesters and store-gateways. #6194 #6309
[ENHANCEMENT] Querier: Add cortex_querier_federation_exemplar_tenants_queried and cortex_querier_federation_tenants_queried metrics to track the number of tenants queried by multi-tenant queries. #6374 #6409
[ENHANCEMENT] All: added an experimental -server.grpc.num-workers flag that configures the number of long-living workers used to process gRPC requests. This could decrease the CPU usage by reducing the number of stack allocations. #6311
[ENHANCEMENT] All: improved IPv6 support by using the proper host:port formatting. #6311
[ENHANCEMENT] Querier: always return error encountered during chunks streaming, rather than the stream has already been exhausted. #6345 #6433
[ENHANCEMENT] Query-frontend: add instance_enable_ipv6 to support IPv6. #6111
[ENHANCEMENT] Store-gateway: return same detailed error messages as queriers when chunks or series limits are reached. #6347
[ENHANCEMENT] Querier: reduce memory consumed for queries that hit store-gateways. #6348
[ENHANCEMENT] Ruler: include corresponding trace ID with log messages associated with rule evaluation. #6379 #6520
[ENHANCEMENT] Querier: clarify log messages and span events emitted while querying ingesters, and include both ingester name and address when relevant. #6381
[ENHANCEMENT] Memcached: introduce new experimental configuration parameters -<prefix>.memcached.write-buffer-size-bytes -<prefix>.memcached.read-buffer-size-bytes to customise the memcached client write and read buffer size (the buffer is allocated for each memcached connection). #6468
[ENHANCEMENT] Ingester, Distributor: added experimental support for rejecting push requests received via gRPC before reading them into memory, if ingester or distributor is unable to accept the request. This is activated by using -ingester.limit-inflight-requests-using-grpc-method-limiter for ingester, and -distributor.limit-inflight-requests-using-grpc-method-limiter for distributor. #5976 #6300
[ENHANCEMENT] Add capability in store-gateways to accept number of tokens through config. -store-gateway.sharding-ring.num-tokens, default-value=512 #4863
[ENHANCEMENT] Query-frontend: return warnings generated during query evaluation. #6391
[ENHANCEMENT] Server: Add the option -server.http-read-header-timeout to enable specifying a timeout for reading HTTP request headers. It defaults to 0, in which case reading of headers can take up to -server.http-read-timeout, leaving no time for reading body, if there's any. #6517
[ENHANCEMENT] Add connection-string option, -<prefix>.azure.connection-string, for Azure Blob Storage. #6487
[ENHANCEMENT] Ingester: Add -ingester.instance-limits.max-inflight-push-requests-bytes. This limit protects the ingester against requests that together may cause an OOM. #6492
[ENHANCEMENT] Ingester: add new per-tenant cortex_ingester_local_limits metric to expose the calculated local per-tenant limits seen at each ingester. Exports the local per-tenant series limit with label {limit="max_global_series_per_user"} #6403
[ENHANCEMENT] Query-frontend: added "queue_time_seconds" field to "query stats" log. This is total time that query and subqueries spent in the queue, before queriers picked it up. #6537
[ENHANCEMENT] Server: Add -server.report-grpc-codes-in-instrumentation-label-enabled CLI flag to specify whether gRPC status codes should be used in status_code label of cortex_request_duration_seconds metric. It defaults to false, meaning that successful and erroneous gRPC status codes are represented with success and error respectively. #6562
[ENHANCEMENT] Server: Add -ingester.client.report-grpc-codes-in-instrumentation-label-enabled CLI flag to specify whether gRPC status codes should be used in status_code label of cortex_ingester_client_request_duration_seconds metric. It defaults to false, meaning that successful and erroneous gRPC status codes are represented with 2xx and error respectively. #6562
[ENHANCEMENT] Server: Add -server.http-log-closed-connections-without-response-enabled option to log details about connections to HTTP server that were closed before any data was sent back. This can happen if client doesn't manage to send complete HTTP headers before timeout. #6612
[ENHANCEMENT] Query-frontend: include length of query, time since the earliest and latest points of a query, time since the earliest and latest points of a query, cached/uncached bytes in "query stats" logs. Time parameters (start/end/time) are always formatted as RFC3339 now. #6473 #6477 #6709 #6710
[ENHANCEMENT] Query-frontend: -query-frontend.align-queries-with-step has been moved from a global flag to a per-tenant override. #6714
[ENHANCEMENT] Distributor: added support for reducing the resolution of native histogram samples upon ingestion if the sample has too many buckets compared to -validation.max-native-histogram-buckets. This is enabled by default and can be turned off by setting -validation.reduce-native-histogram-over-max-buckets to false. #6535
[ENHANCEMENT] Query-frontend: optionally wait for the frontend to complete startup if requests are received while the frontend is still starting. Disabled by default, set -query-frontend.not-running-timeout to a non-zero value to enable. #6621
[ENHANCEMENT] Distributor: Include source IPs in OTLP push handler logs. #6652
[ENHANCEMENT] Query-frontend: return clearer error message when a query request is received while shutting down. #6675
[ENHANCEMENT] Querier: return clearer error message when a query request is cancelled by the caller. #6697
[ENHANCEMENT] Compactor: Mark corrupted blocks for no-compaction to avoid blocking compactor future runs. #6588
[ENHANCEMENT] Distributor: Added an experimental configuration option distributor.ingestion-burst-factor that overrides the distributor.ingestion-burst-size option if set. The distributor.ingestion-burst-factor is used to set the underlying ingestion rate limiter token bucket's burst size to a multiple of the per distributor distributor.ingestion-rate-limit and the distributor.ingestion-burst-factor. This is disabled by default. #6662
[ENHANCEMENT] Add debug message to track tenants sending queries that are not able to benefit from caches. #6732
[BUGFIX] Distributor: return server overload error in the event of exceeding the ingestion rate limit. #6549
[BUGFIX] Ring: Ensure network addresses used for component hash rings are formatted correctly when using IPv6. #6068
[BUGFIX] Query-scheduler: don't retain connections from queriers that have shut down, leading to gradually increasing enqueue latency over time. #6100 #6145
[BUGFIX] Ingester: prevent query logic from continuing to execute after queries are canceled. #6085
[BUGFIX] Ensure correct nesting of children of the querier.Select tracing span. #6085
[BUGFIX] Packaging: fix preremove script preventing upgrades on RHEL based OS. #6067
[BUGFIX] Querier: return actual error rather than attempted to read series at index XXX from stream, but the stream has already been exhausted (or even no error at all) when streaming chunks from ingesters or store-gateways is enabled and an error occurs while streaming chunks. #6346
[BUGFIX] Querier: reduce log volume when querying ingesters with zone-awareness enabled and one or more instances in a single zone unavailable. #6381
[BUGFIX] Querier: don't try to query further ingesters if ingester query request minimization is enabled and a query limit is reached as a result of the responses from the initial set of ingesters. #6402
[BUGFIX] Ingester: Don't cache context cancellation error when querying. #6446
[BUGFIX] Ingester: don't ignore errors encountered while iterating through chunks or samples in response to a query request. #6469
[BUGFIX] All: fix issue where traces for some inter-component gRPC calls would incorrectly show the call as failing due to cancellation. #6470
[BUGFIX] Querier: correctly mark streaming requests to ingesters or store-gateways as successful, not cancelled, in metrics and traces. #6471 #6505
[BUGFIX] Querier: fix issue where queries fail with "context canceled" error when an ingester or store-gateway fails healthcheck while the query is in progress. #6550
[BUGFIX] Tracing: When creating an OpenTelemetry tracing span, add it to the context for later retrieval. #6614
[BUGFIX] Querier: always report query results to query-frontends, even when cancelled, to ensure query-frontends don't wait for results that will otherwise never arrive. #6703
[BUGFIX] Querier: attempt to query ingesters in PENDING state, to reduce the likelihood that scaling up the number of ingesters in multiple zones simultaneously causes a read outage. #6726 #6727
[BUGFIX] Querier: don't cancel inflight queries from a query-scheduler if the stream between the querier and query-scheduler is broken. #6728
[BUGFIX] Store-gateway: Fix double-counting of some duration metrics. #6616
[BUGFIX] Fixed possible series matcher corruption leading to wrong series being included in query results. #6884

Mixin

[CHANGE] Dashboards: enabled reporting gRPC codes as status_code label in Mimir dashboards. In case of gRPC calls, the successful status_code label on cortex_request_duration_seconds and gRPC client request duration metrics has changed from 'success' and '2xx' to 'OK'. #6561
[CHANGE] Alerts: remove MimirGossipMembersMismatch alert and replace it with MimirGossipMembersTooHigh and MimirGossipMembersTooLow alerts that should have a higher signal-to-noise ratio. #6508
[ENHANCEMENT] Dashboards: Optionally show rejected requests on Mimir Writes dashboard. Useful when used together with "early request rejection" in ingester and distributor. #6132 #6556
[ENHANCEMENT] Alerts: added a critical alert for CompactorSkippedBlocksWithOutOfOrderChunks when multiple blocks are affected. #6410
[ENHANCEMENT] Dashboards: Added the min-replicas for autoscaling dashboards. #6528
[ENHANCEMENT] Dashboards: Show queries per second for the /api/v1/cardinality/ endpoints on the "Overview" dashboard. #6720
[BUGFIX] Alerts: fixed issue where GossipMembersMismatch warning message referred to per-instance labels that were not produced by the alert query. #6146
[BUGFIX] Dashboards: Fix autoscaling dashboard panels for KEDA > 2.9. Requires scraping the KEDA operator for metrics since they moved. #6528
[BUGFIX] Alerts: Fix autoscaling alerts for KEDA > 2.9. Requires scraping the KEDA operator for metrics since they moved. #6528

Jsonnet

[CHANGE] Ingester: reduce -server.grpc-max-concurrent-streams to 500. #5666
[CHANGE] Changed default _config.cluster_domain from cluster.local to cluster.local. to reduce the number of DNS lookups made by Mimir. #6389
[CHANGE] Query-frontend: changed default _config.autoscaling_query_frontend_cpu_target_utilization from 1 to 0.75. #6395
[CHANGE] Distributor: Increase HPA scale down period such that distributors are slower to scale down after autoscaling up. #6589
[CHANGE] Store-gateway: Change the default timeout used for index-queries caches from 200ms to 450ms. #6786
[FEATURE] Store-gateway: Allow automated zone-by-zone downscaling, that can be enabled via the store_gateway_automated_downscale_enabled flag. It is disabled by default. #6149
[FEATURE] Ingester: Allow to configure TSDB Head early compaction using the following _config parameters: #6181
- ingester_tsdb_head_early_compaction_enabled (disabled by default)
- ingester_tsdb_head_early_compaction_reduction_percentage
- ingester_tsdb_head_early_compaction_min_in_memory_series
[ENHANCEMENT] Double the amount of rule groups for each user tier. #5897
[ENHANCEMENT] Set maxUnavailable to 0 for distributor, overrides-exporter, querier, query-frontend, query-scheduler ruler-querier, ruler-query-frontend, ruler-query-scheduler and consul deployments, to ensure they don't become completely unavailable during a rollout. #5924
[ENHANCEMENT] Update rollout-operator to v0.9.0. #6022 #6110 #6558 #6681
[ENHANCEMENT] Update memcached to memcached:1.6.22-alpine. #6585
[ENHANCEMENT] Store-gateway: replaced the following deprecated CLI flags: #6319
- -blocks-storage.bucket-store.index-header-lazy-loading-enabled replaced with -blocks-storage.bucket-store.index-header.lazy-loading-enabled
- -blocks-storage.bucket-store.index-header-lazy-loading-idle-timeout replaced with -blocks-storage.bucket-store.index-header.lazy-loading-idle-timeout
[ENHANCEMENT] Store-gateway: Allow selective enablement of store-gateway automated scaling on a per-zone basis. #6302
[BUGFIX] Autoscaling: KEDA > 2.9 removed the ability to set metricName in the trigger metadata. To help discern which metric is used by the HPA, we set the trigger name to what was the metricName. This is available as the scaler label on keda_* metrics. #6528

Mimirtool

[ENHANCEMENT] Analyze Grafana: Improve support for variables in range. #6657
[BUGFIX] Fix out of bounds error on export with large timespans and/or series count. #5700
[BUGFIX] Fix the issue where --read-timeout was applied to the entire mimirtool analyze grafana invocation rather than to individual Grafana API calls. #5915
[BUGFIX] Fix incorrect remote-read path joining for mimirtool remote-read commands on Windows. #6011
[BUGFIX] Fix template files full path being sent in mimirtool alertmanager load command. #6138
[BUGFIX] Analyze rule-file: .metricsUsed field wasn't populated. #6953

Mimir Continuous Test

Query-tee

Documentation

[ENHANCEMENT] Document the concept of native histograms and how to send them to Mimir, migration path. #5956 #6488 #6539 #6752
[ENHANCEMENT] Document native histograms query and visualization. #6231

Tools

[CHANGE] tsdb-index: Rename tool to tsdb-series. #6317
[FEATURE] tsdb-labels: Add tool to print label names and values of a TSDB block. #6317
[ENHANCEMENT] trafficdump: Trafficdump can now parse OTEL requests. Entire request is dumped to output, there's no filtering of fields or matching of series done. #6108

2.10.5

Grafana Mimir

[ENHANCEMENT] Update Docker base images from alpine:3.18.3 to alpine:3.18.5. #6897
[BUGFIX] Fixed possible series matcher corruption leading to wrong series being included in query results. #6886

Documentation

[ENHANCEMENT] Document the concept of native histograms and how to send them to Mimir, migration path. #6757
[ENHANCEMENT] Document native histograms query and visualization. #6757

2.10.4

Grafana Mimir

[BUGFIX] Update otelhttp library to v0.44.0 as a mitigation for CVE-2023-45142. #6634

2.10.3

Grafana Mimir

[BUGFIX] Update grpc-go library to 1.57.2-dev that includes a fix for a bug introduced in 1.57.1. #6419

2.10.2

Grafana Mimir

[BUGFIX] Update grpc-go library to 1.57.1 and golang.org/x/net to 0.17, which include fix for CVE-2023-44487. #6349

2.10.1

Grafana Mimir

[CHANGE] Update Go version to 1.21.3. #6244 #6325
[BUGFIX] Query-frontend: Don't retry read requests rejected by the ingester due to utilization based read path limiting. #6032
[BUGFIX] Ingester: fix panic in WAL replay of certain native histograms. #6086

2.10.0

Grafana Mimir

[CHANGE] Store-gateway: skip verifying index header integrity upon loading. To enable verification set blocks_storage.bucket_store.index_header.verify_on_load: true. #5174
[CHANGE] Querier: change the default value of the experimental -querier.streaming-chunks-per-ingester-buffer-size flag to 256. #5203
[CHANGE] Querier: only initiate query requests to ingesters in the ACTIVE state in the ring. #5342
[CHANGE] Querier: renamed -querier.prefer-streaming-chunks to -querier.prefer-streaming-chunks-from-ingesters to enable streaming chunks from ingesters to queriers. #5182
[CHANGE] Querier: -query-frontend.cache-unaligned-requests has been moved from a global flag to a per-tenant override. #5312
[CHANGE] Ingester: removed cortex_ingester_shipper_dir_syncs_total and cortex_ingester_shipper_dir_sync_failures_total metrics. The former metric was not much useful, and the latter was never incremented. #5396
[CHANGE] Ingester: removed logging of errors related to hitting per-instance limits to reduce resource usage when ingesters are under pressure. #5585
[CHANGE] gRPC clients: use default connect timeout of 5s, and therefore enable default connect backoff max delay of 5s. #5562
[CHANGE] Ingester: the -validation.create-grace-period is now enforced in the ingester too, other than distributor and query-frontend. If you've configured -validation.create-grace-period then make sure the configuration is applied to ingesters too. #5712
[CHANGE] Distributor: the -validation.create-grace-period is now enforced for examplars too in the distributor. If an examplar has timestamp greater than "now + grace_period", then the exemplar will be dropped and the metric cortex_discarded_exemplars_total{reason="exemplar_too_far_in_future",user="..."} increased. #5761
[CHANGE] Query-frontend: the -validation.create-grace-period is now enforced in the query-frontend even when the configured value is 0. When the value is 0, the query end time range is truncated to the current real-world time. #5829
[CHANGE] Store-gateway: deprecated configuration parameters for index header under blocks-storage.bucket-store and use a new configurations in blocks-storage.bucket-store.index-header, deprecated configuration will be removed in Mimir 2.12. Configuration changes: #5726
- -blocks-storage.bucket-store.index-header-lazy-loading-enabled is deprecated, use the new configuration -blocks-storage.bucket-store.index-header.lazy-loading-enabled
- -blocks-storage.bucket-store.index-header-lazy-loading-idle-timeout is deprecated, use the new configuration -blocks-storage.bucket-store.index-header.lazy-loading-idle-timeout
- -blocks-storage.bucket-store.index-header-lazy-loading-concurrency is deprecated, use the new configuration -blocks-storage.bucket-store.index-header.lazy-loading-concurrency
[CHANGE] Store-gateway: remove experimental fine-grained chunks caching. The following experimental configuration parameters have been removed -blocks-storage.bucket-store.chunks-cache.fine-grained-chunks-caching-enabled, -blocks-storage.bucket-store.fine-grained-chunks-caching-ranges-per-series. #5816 #5875
[CHANGE] Ingester: remove deprecated blocks-storage.tsdb.max-tsdb-opening-concurrency-on-startup. #5850
[FEATURE] Introduced -distributor.service-overload-status-code-on-rate-limit-enabled flag for configuring status code to 529 instead of 429 upon rate limit exhaustion. #5752
[FEATURE] Cardinality API: added a new count_method parameter which enables counting active series. #5136
[FEATURE] Query-frontend: added experimental support to cache cardinality, label names and label values query responses. The cache will be used when -query-frontend.cache-results is enabled, and -query-frontend.results-cache-ttl-for-cardinality-query or -query-frontend.results-cache-ttl-for-labels-query set to a value greater than 0. The following metrics have been added to track the query results cache hit ratio per request_type: #5212 #5235 #5426 #5524
- cortex_frontend_query_result_cache_requests_total{request_type="query_range|cardinality|label_names_and_values"}
- cortex_frontend_query_result_cache_hits_total{request_type="query_range|cardinality|label_names_and_values"}
[FEATURE] Added -<prefix>.s3.list-objects-version flag to configure the S3 list objects version. #5099
[FEATURE] Ingester: add optional CPU/memory utilization based read request limiting, considered experimental. Disabled by default, enable by configuring limits via both of the following flags: #5012 #5392 #5394 #5526 #5508 #5704
- -ingester.read-path-cpu-utilization-limit
- -ingester.read-path-memory-utilization-limit
- -ingester.log-utilization-based-limiter-cpu-samples
[FEATURE] Ruler: support filtering results from rule status endpoint by file, rule_group and rule_name. #5291
[FEATURE] Ingester: add experimental support for creating tokens by using spread minimizing strategy. This can be enabled with -ingester.ring.token-generation-strategy: spread-minimizing and -ingester.ring.spread-minimizing-zones: <all available zones>. In that case -ingester.ring.tokens-file-path must be empty. #5308 #5324
[FEATURE] Storegateway: Persist sparse index-headers to disk and read from disk on index-header loads instead of reconstructing. #5465 #5651 #5726
[FEATURE] Ingester: add experimental CLI flag -ingester.ring.spread-minimizing-join-ring-in-order that allows an ingester to register tokens in the ring only after all previous ingesters (with ID lower than its own ID) have already been registered. #5541
[FEATURE] Ingester: add experimental support to compact the TSDB Head when the number of in-memory series is equal or greater than -blocks-storage.tsdb.early-head-compaction-min-in-memory-series, and the ingester estimates that the per-tenant TSDB Head compaction will reduce in-memory series by at least -blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage. #5371
[FEATURE] Ingester: add new metrics for tracking native histograms in active series: cortex_ingester_active_native_histogram_series, cortex_ingester_active_native_histogram_series_custom_tracker, cortex_ingester_active_native_histogram_buckets, cortex_ingester_active_native_histogram_buckets_custom_tracker. The first 2 are the subsets of the existing and unmodified cortex_ingester_active_series and cortex_ingester_active_series_custom_tracker respectively, only tracking native histogram series, and the last 2 are the equivalents for tracking the number of buckets in native histogram series. #5318
[FEATURE] Add experimental CLI flag -<prefix>.s3.native-aws-auth-enabled that allows to enable the default credentials provider chain of the AWS SDK. #5636
[FEATURE] Distributor: add experimental support for circuit breaking when writing to ingesters via -ingester.client.circuit-breaker.enabled, -ingester.client.circuit-breaker.failure-threshold, or -ingester.client.circuit-breaker.cooldown-period or their corresponding YAML. #5650
[FEATURE] The following features are no longer considered experimental. #5701 #5872
- Ruler storage cache (-ruler-storage.cache.*)
- Exclude ingesters running in specific zones (-ingester.ring.excluded-zones)
- Cardinality-based query sharding (-query-frontend.query-sharding-target-series-per-shard)
- Cardinality query result caching (-query-frontend.results-cache-ttl-for-cardinality-query)
- Label names and values query result caching (-query-frontend.results-cache-ttl-for-labels-query)
- Query expression size limit (-query-frontend.max-query-expression-size-bytes)
- Peer discovery / tenant sharding for overrides exporters (-overrides-exporter.ring.enabled)
- Configuring enabled metrics in overrides exporter (-overrides-exporter.enabled-metrics)
- Per-tenant results cache TTL (-query-frontend.results-cache-ttl, -query-frontend.results-cache-ttl-for-out-of-order-time-window)
- Shutdown delay (-shutdown-delay)
[FEATURE] Querier: add experimental CLI flag -tenant-federation.max-concurrent to adjust the max number of per-tenant queries that can be run at a time when executing a single multi-tenant query. #5874
[FEATURE] Alertmanager: add Microsoft Teams as a supported integration. #5840
[ENHANCEMENT] Overrides-exporter: Add new metrics for write path and alertmanager (max_global_metadata_per_user, max_global_metadata_per_metric, request_rate, request_burst_size, alertmanager_notification_rate_limit, alertmanager_max_dispatcher_aggregation_groups, alertmanager_max_alerts_count, alertmanager_max_alerts_size_bytes) and added flag -overrides-exporter.enabled-metrics to explicitly configure desired metrics, e.g. -overrides-exporter.enabled-metrics=request_rate,ingestion_rate. Default value for this flag is: ingestion_rate,ingestion_burst_size,max_global_series_per_user,max_global_series_per_metric,max_global_exemplars_per_user,max_fetched_chunks_per_query,max_fetched_series_per_query,ruler_max_rules_per_rule_group,ruler_max_rule_groups_per_tenant. #5376
[ENHANCEMENT] Cardinality API: when zone aware replication is enabled, the label values cardinality API can now tolerate single zone failure #5178
[ENHANCEMENT] Distributor: optimize sending requests to ingesters when incoming requests don't need to be modified. For now this feature can be disabled by setting -timeseries-unmarshal-caching-optimization-enabled=false. #5137
[ENHANCEMENT] Add advanced CLI flags to control gRPC client behaviour: #5161
- -<prefix>.connect-timeout
- -<prefix>.connect-backoff-base-delay
- -<prefix>.connect-backoff-max-delay
- -<prefix>.initial-stream-window-size
- -<prefix>.initial-connection-window-size
[ENHANCEMENT] Query-frontend: added "response_size_bytes" field to "query stats" log. #5196
[ENHANCEMENT] Querier: refine error messages for per-tenant query limits, informing the user of the preferred strategy for not hitting the limit, in addition to how they may tweak the limit. #5059
[ENHANCEMENT] Distributor: optimize sending of requests to ingesters by reusing memory buffers for marshalling requests. This optimization can be enabled by setting -distributor.write-requests-buffer-pooling-enabled to true. #5195 #5805 #5830
[ENHANCEMENT] Querier: add experimental -querier.minimize-ingester-requests option to initially query only the minimum set of ingesters required to reach quorum. #5202 #5259 #5263
[ENHANCEMENT] Querier: improve error message when streaming chunks from ingesters to queriers and a query limit is reached. #5245
[ENHANCEMENT] Use new data structure for labels, to reduce memory consumption. #3555 #5731
[ENHANCEMENT] Update alpine base image to 3.18.2. #5276
[ENHANCEMENT] Ruler: add cortex_ruler_sync_rules_duration_seconds metric, tracking the time spent syncing all rule groups owned by the ruler instance. #5311
[ENHANCEMENT] Store-gateway: add experimental blocks-storage.bucket-store.index-header-lazy-loading-concurrency config option to limit the number of concurrent index-headers loads when lazy loading. #5313 #5605
[ENHANCEMENT] Ingester and querier: improve level of detail in traces emitted for queries that hit ingesters. #5315
[ENHANCEMENT] Querier: add cortex_querier_queries_rejected_total metric that counts the number of queries rejected due to hitting a limit (eg. max series per query or max chunks per query). #5316 #5440 #5450
[ENHANCEMENT] Querier: add experimental -querier.minimize-ingester-requests-hedging-delay option to initiate requests to further ingesters when request minimisation is enabled and not all initial requests have completed. #5368
[ENHANCEMENT] Clarify docs for -ingester.client.* flags to make it clear that these are used by both queriers and distributors. #5375
[ENHANCEMENT] Querier and store-gateway: add experimental support for streaming chunks from store-gateways to queriers while evaluating queries. This can be enabled with -querier.prefer-streaming-chunks-from-store-gateways=true. #5182
[ENHANCEMENT] Querier: enforce max-chunks-per-query limit earlier in query processing when streaming chunks from ingesters to queriers to avoid unnecessarily consuming resources for queries that will be aborted. #5369 #5447
[ENHANCEMENT] Ingester: added cortex_ingester_shipper_last_successful_upload_timestamp_seconds metric tracking the last successful TSDB block uploaded to the bucket (unix timestamp in seconds). #5396
[ENHANCEMENT] Ingester: add two metrics tracking resource utilization calculated by utilization based limiter: #5496
- cortex_ingester_utilization_limiter_current_cpu_load: The current exponential weighted moving average of the ingester's CPU load
- cortex_ingester_utilization_limiter_current_memory_usage_bytes: The current ingester memory utilization
[ENHANCEMENT] Ruler: added insight=true field to ruler's prometheus component for rule evaluation logs. #5510
[ENHANCEMENT] Distributor Ingester: add metrics to count the number of requests rejected for hitting per-instance limits, cortex_distributor_instance_rejected_requests_total and cortex_ingester_instance_rejected_requests_total respectively. #5551
[ENHANCEMENT] Distributor: add support for ingesting exponential histograms that are over the native histogram scale limit of 8 in OpenTelemetry format by downscaling them. #5532 #5607
[ENHANCEMENT] General: buffered logging: #5506
- -log.buffered CLI flag enable buffered logging.
[ENHANCEMENT] Distributor: add more detailed information to traces generated while processing OTLP write requests. #5539
[ENHANCEMENT] Distributor: improve performance ingesting OTLP payloads. #5531 #5607 #5616
[ENHANCEMENT] Ingester: optimize label-values with matchers call when number of matched series is small. #5600
[ENHANCEMENT] Compactor: delete bucket-index, markers and debug files if there are no blocks left in the bucket index. This cleanup must be enabled by using -compactor.no-blocks-file-cleanup-enabled option. #5648
[ENHANCEMENT] Ingester: reduce memory usage of active series tracker. #5665
[ENHANCEMENT] Store-gateway: added -store-gateway.sharding-ring.auto-forget-enabled configuration parameter to control whether store-gateway auto-forget feature should be enabled or disabled (enabled by default). #5702
[ENHANCEMENT] Compactor: added per tenant block upload counters cortex_block_upload_api_blocks_total, cortex_block_upload_api_bytes_total, and cortex_block_upload_api_files_total. #5738
[ENHANCEMENT] Compactor: verify time range of compacted block(s) matches the time range of input blocks. #5760
[ENHANCEMENT] Querier: improved observability of calls to ingesters during queries. #5724
[ENHANCEMENT] Compactor: block backfilling logging is now more verbose. #5711
[ENHANCEMENT] Added support to rate limit application logs: #5764
- -log.rate-limit-enabled
- -log.rate-limit-logs-per-second
- -log.rate-limit-logs-per-second-burst
[ENHANCEMENT] Ingester: added cortex_ingester_tsdb_head_min_timestamp_seconds and cortex_ingester_tsdb_head_max_timestamp_seconds metrics which return min and max time of all TSDB Heads open in an ingester. #5786 #5815
[ENHANCEMENT] Querier: cancel query requests to ingesters in a zone upon first error received from the zone, to reduce wasted effort spent computing results that won't be used #5764
[ENHANCEMENT] All: improve tracing of internal HTTP requests sent over httpgrpc. #5782
[ENHANCEMENT] Querier: add experimental per-query chunks limit based on an estimate of the number of chunks that will be sent from ingesters and store-gateways that is enforced earlier during query evaluation. This limit is disabled by default and can be configured with -querier.max-estimated-fetched-chunks-per-query-multiplier. #5765
[ENHANCEMENT] Ingester: add UI for listing tenants with TSDB on given ingester and viewing details of tenants's TSDB on given ingester. #5803 #5824
[ENHANCEMENT] Querier: improve observability of calls to store-gateways during queries. #5809
[ENHANCEMENT] Query-frontend: improve tracing of interactions with query-scheduler. #5818
[ENHANCEMENT] Query-scheduler: improve tracing of requests when request is rejected by query-scheduler. #5848
[ENHANCEMENT] Ingester: avoid logging some errors that could cause logging contention. #5494 #5581
[ENHANCEMENT] Store-gateway: wait for query gate after loading blocks. #5507
[ENHANCEMENT] Store-gateway: always include __name__ posting group in selection in order to reduce the number of object storage API calls. #5246
[ENHANCEMENT] Ingester: track active series by ref instead of hash/labels to reduce memory usage. #5134 #5193
[ENHANCEMENT] Go: updated to 1.21.1. #5955 #5960
[ENHANCEMENT] Alertmanager: updated to alertmanager 0.26.0. #5840
[BUGFIX] Ingester: Handle when previous ring state is leaving and the number of tokens has changed. #5204
[BUGFIX] Querier: fix issue where queries that use the timestamp() function fail with execution: attempted to read series at index 0 from stream, but the stream has already been exhausted if streaming chunks from ingesters to queriers is enabled. #5370
[BUGFIX] memberlist: bring back memberlist_client_kv_store_count metric that used to exist in Cortex, but got lost during dskit updates before Mimir 2.0. #5377
[BUGFIX] Querier: pass on HTTP 503 query response code. #5364
[BUGFIX] Store-gateway: Fix issue where stopping a store-gateway could cause all store-gateways to unload all blocks. #5464
[BUGFIX] Allocate ballast in smaller blocks to avoid problem when entire ballast was kept in memory working set. #5565
[BUGFIX] Querier: retry frontend result notification when an error is returned. #5591
[BUGFIX] Querier: fix issue where cortex_ingester_client_request_duration_seconds metric did not include streaming query requests that did not return any series. #5695
[BUGFIX] Ingester: fix ActiveSeries tracker double-counting series that have been deleted from the Head while still being active and then recreated again. #5678
[BUGFIX] Ingester: don't set "last update time" of TSDB into the future when opening TSDB. This could prevent detecting of idle TSDB for a long time, if sample in distant future was ingested. #5787
[BUGFIX] Store-gateway: fix bug when lazy index header could be closed prematurely even when still in use. #5795
[BUGFIX] Ruler: gracefully shut down rule evaluations. #5778
[BUGFIX] Querier: fix performance when ingesters stream samples. #5836
[BUGFIX] Ingester: fix spurious not found errors on label values API during head compaction. #5957
[BUGFIX] All: updated Minio object storage client from 7.0.62 to 7.0.63 to fix auto-detection of AWS GovCloud environments. #5905

Mixin

[CHANGE] Dashboards: show all workloads in selected namespace on "rollout progress" dashboard. #5113
[CHANGE] Dashboards: show the number of updated and ready pods for each workload in the "rollout progress" panel on the "rollout progress" dashboard. #5113
[CHANGE] Dashboards: removed "Query results cache misses" panel on the "Mimir / Queries" dashboard. #5423
[CHANGE] Dashboards: default to shared crosshair on all dashboards. #5489
[CHANGE] Dashboards: sort variable drop-down lists from A to Z, rather than Z to A. #5490
[CHANGE] Alerts: removed MimirProvisioningTooManyActiveSeries alert. You should configure -ingester.instance-limits.max-series and rely on MimirIngesterReachingSeriesLimit alert instead. #5593
[CHANGE] Alerts: removed MimirProvisioningTooManyWrites alert. The alerting threshold used in this alert was chosen arbitrarily and ingesters receiving an higher number of samples / sec don't necessarily have any issue. You should rely on SLOs metrics and alerts instead. #5706
[CHANGE] Alerts: don't raise MimirRequestErrors or MimirRequestLatency alert for the /debug/pprof endpoint. #5826
[ENHANCEMENT] Dashboards: adjust layout of "rollout progress" dashboard panels so that the "rollout progress" panel doesn't require scrolling. #5113
[ENHANCEMENT] Dashboards: show container name first in "pods count per version" panel on "rollout progress" dashboard. #5113
[ENHANCEMENT] Dashboards: show time spend waiting for turn when lazy loading index headers in the "index-header lazy load gate latency" panel on the "queries" dashboard. #5313
[ENHANCEMENT] Dashboards: split query results cache hit ratio by request type in "Query results cache hit ratio" panel on the "Mimir / Queries" dashboard. #5423
[ENHANCEMENT] Dashboards: add "rejected queries" panel to "queries" dashboard. #5429
[ENHANCEMENT] Dashboards: add native histogram active series and active buckets to "tenants" dashboard. #5543
[ENHANCEMENT] Dashboards: add panels to "Mimir / Writes" for requests rejected for per-instance limits. #5638
[ENHANCEMENT] Dashboards: rename "Blocks currently loaded" to "Blocks currently owned" in the "Mimir / Queries" dashboard. #5705
[ENHANCEMENT] Alerts: Add MimirIngestedDataTooFarInTheFuture warning alert that triggers when Mimir ingests sample with timestamp more than 1h in the future. #5822
[BUGFIX] Alerts: fix MimirIngesterRestarts to fire only when the ingester container is restarted, excluding the cases the pod is rescheduled. #5397
[BUGFIX] Dashboards: fix "unhealthy pods" panel on "rollout progress" dashboard showing only a number rather than the name of the workload and the number of unhealthy pods if only one workload has unhealthy pods. #5113 #5200
[BUGFIX] Alerts: fixed MimirIngesterHasNotShippedBlocks and MimirIngesterHasNotShippedBlocksSinceStart alerts. #5396
[BUGFIX] Alerts: Fix MimirGossipMembersMismatch to include admin-api and custom compactor pods. admin-api is a GEM component. #5641 #5797
[BUGFIX] Dashboards: fix autoscaling dashboard panels that could show multiple series for a single component. #5810
[BUGFIX] Dashboards: fix ruler-querier scaling metric panel query and split into CPU and memory scaling metric panels. #5739

Jsonnet

[CHANGE] Removed _config.querier.concurrency configuration option and replaced it with _config.querier_max_concurrency and _config.ruler_querier_max_concurrency to allow to easily fine tune it for different querier deployments. #5322
[CHANGE] Change _config.multi_zone_ingester_max_unavailable to 50. #5327
[CHANGE] Change distributors rolling update strategy configuration: maxSurge and maxUnavailable are set to 15% and 0. #5714
[FEATURE] Alertmanager: Add horizontal pod autoscaler config, that can be enabled using autoscaling_alertmanager_enabled: true. #5194 #5249
[ENHANCEMENT] Enable the track_sizes feature for Memcached pods to help determine cache efficiency. #5209
[ENHANCEMENT] Add per-container map for environment variables. #5181
[ENHANCEMENT] Add PodDisruptionBudgets for compactor, continuous-test, distributor, overrides-exporter, querier, query-frontend, query-scheduler, rollout-operator, ruler, ruler-querier, ruler-query-frontend, ruler-query-scheduler, and all memcached workloads. #5098
[ENHANCEMENT] Ruler: configure the ruler storage cache when the metadata cache is enabled. #5326 #5334
[ENHANCEMENT] Shuffle-sharding: ingester shards in user-classes can now be configured to target different series and limit percentage utilization through _config.shuffle_sharding.target_series_per_ingester and _config.shuffle_sharding.target_utilization_percentage values. #5470
[ENHANCEMENT] Distributor: allow adjustment of the targeted CPU usage as a percentage of requested CPU. This can be adjusted with _config.autoscaling_distributor_cpu_target_utilization. #5525
[ENHANCEMENT] Ruler: add configuration option _config.ruler_remote_evaluation_max_query_response_size_bytes to easily set the maximum query response size allowed (in bytes). #5592
[ENHANCEMENT] Distributor: dynamically set GOMAXPROCS based on the CPU request. This should reduce distributor CPU utilization, assuming the CPU request is set to a value close to the actual utilization. #5588
[ENHANCEMENT] Querier: dynamically set GOMAXPROCS based on the CPU request. This should reduce noisy neighbour issues created by the querier, whose CPU utilization could eventually saturate the Kubernetes node if unbounded. #5646 #5658
[ENHANCEMENT] Allow to remove an entry from the configured environment variable for a given component, setting the environment value to null in the *_env_map objects (e.g. store_gateway_env_map+:: { 'field': null}). #5599
[ENHANCEMENT] Allow overriding the default number of replicas for etcd. #5589
[ENHANCEMENT] Memcached: reduce memory request for results, chunks and metadata caches. The requested memory is 5% greater than the configured memcached max cache size. #5661
[ENHANCEMENT] Autoscaling: Add the following configuration options to fine tune autoscaler target utilization: #5679 #5682 #5689
- autoscaling_querier_target_utilization (defaults to 0.75)
- autoscaling_mimir_read_target_utilization (defaults to 0.75)
- autoscaling_ruler_querier_cpu_target_utilization (defaults to 1)
- autoscaling_distributor_memory_target_utilization (defaults to 1)
- autoscaling_ruler_cpu_target_utilization (defaults to 1)
- autoscaling_query_frontend_cpu_target_utilization (defaults to 1)
- autoscaling_ruler_query_frontend_cpu_target_utilization (defaults to 1)
- autoscaling_alertmanager_cpu_target_utilization (defaults to 1)
[ENHANCEMENT] Gossip-ring: add appProtocol for istio compatibility. #5680
[ENHANCEMENT] Add _config.commonConfig to allow adding common configuration parameters for all Mimir components. #5703
[ENHANCEMENT] Update rollout-operator to v0.7.0. #5718
[ENHANCEMENT] Increase the default rollout speed for store-gateway when lazy loading is disabled. #5823
[ENHANCEMENT] Add autoscaling on memory for ruler-queriers. #5739
[ENHANCEMENT] Deduplicate scaled object creation for most objects that scale on CPU and memory. #6411
[BUGFIX] Fix compilation when index, chunks or metadata caches are disabled. #5710
[BUGFIX] Autoscaling: treat OOMing containers as though they are using their full memory request. #5739
[BUGFIX] Autoscaling: if no containers are up, report 0 memory usage instead of no data. #6411

Mimirtool

[ENHANCEMENT] Mimirtool uses paging to fetch all dashboards from Grafana when running mimirtool analyse grafana. This allows the tool to work correctly when running against Grafana instances with more than a 1000 dashboards. #5825
[ENHANCEMENT] Extract metric name from queries that have a __name__ matcher. #5911
[BUGFIX] Mimirtool no longer parses label names as metric names when handling templating variables that are populated using label_values(<label_name>) when running mimirtool analyse grafana. #5832
[BUGFIX] Fix panic when analyzing a grafana dashboard with multiline queries in templating variables. #5911

Query-tee

[CHANGE] Proxy Content-Type response header from backend. Previously Content-Type: text/plain; charset=utf-8 was returned on all requests. #5183
[CHANGE] Increase default value of -proxy.compare-skip-recent-samples to avoid racing with recording rule evaluation. #5561
[CHANGE] Add -backend.skip-tls-verify to optionally skip TLS verification on backends. #5656

Documentation

[CHANGE] Fix reference to get-started documentation directory. #5476
[CHANGE] Fix link to external OTLP/HTTP documentation.
[ENHANCEMENT] Improved MimirRulerTooManyFailedQueries runbook. #5586
[ENHANCEMENT] Improved "Recover accidentally deleted blocks" runbook. #5620
[ENHANCEMENT] Documented options and trade-offs to query label names and values. #5582
[ENHANCEMENT] Improved MimirRequestErrors runbook for alertmanager. #5694

Tools

[CHANGE] copyblocks: add support for S3 and the ability to copy between different object storage services. Due to this, the -source-service and -destination-service flags are now required and the -service flag has been removed. #5486
[FEATURE] undelete-block-gcs: Added new tool for undeleting blocks on GCS storage. #5610 #5855
[FEATURE] wal-reader: Added new tool for printing entries in TSDB WAL. #5780
[ENHANCEMENT] ulidtime: add -seconds flag to print timestamps as Unix timestamps. #5621
[ENHANCEMENT] ulidtime: exit with status code 1 if some ULIDs can't be parsed. #5621
[ENHANCEMENT] tsdb-index-toc: added index-header size estimates. #5652
[BUGFIX] Stop tools from panicking when -help flag is passed. #5412
[BUGFIX] Remove github.com/golang/glog command line flags from tools. #5413

2.9.4

Grafana Mimir

[ENHANCEMENT] Update Docker base images from alpine:3.18.3 to alpine:3.18.5. #6895

2.9.3

Grafana Mimir

[BUGFIX] Update go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp to 0.44 which includes a fix for CVE-2023-45142. #6637

2.9.2

Grafana Mimir

[BUGFIX] Update grpc-go library to 1.56.3 and golang.org/x/net to 0.17, which include fix for CVE-2023-44487. #6353 #6364

2.9.1

Grafana Mimir

[ENHANCEMENT] Update alpine base image to 3.18.3. #6021

2.9.0

Grafana Mimir

[CHANGE] Store-gateway: change expanded postings, postings, and label values index cache key format. These caches will be invalidated when rolling out the new Mimir version. #4770 #4978 #5037
[CHANGE] Distributor: remove the "forwarding" feature as it isn't necessary anymore. #4876
[CHANGE] Query-frontend: Change the default value of -query-frontend.query-sharding-max-regexp-size-bytes from 0 to 4096. #4932
[CHANGE] Querier: -querier.query-ingesters-within has been moved from a global flag to a per-tenant override. #4287
[CHANGE] Querier: Use -blocks-storage.tsdb.retention-period instead of -querier.query-ingesters-within for calculating the lookback period for shuffle sharded ingesters. Setting -querier.query-ingesters-within=0 no longer disables shuffle sharding on the read path. #4287
[CHANGE] Block upload: /api/v1/upload/block/{block}/files endpoint now allows file uploads with no Content-Length. #4956
[CHANGE] Store-gateway: deprecate configuration parameters for chunk pooling, they will be removed in Mimir 2.11. The following options are now also ignored: #4996
- -blocks-storage.bucket-store.max-chunk-pool-bytes
- -blocks-storage.bucket-store.chunk-pool-min-bucket-size-bytes
- -blocks-storage.bucket-store.chunk-pool-max-bucket-size-bytes
[CHANGE] Store-gateway: remove metrics cortex_bucket_store_chunk_pool_requested_bytes_total and cortex_bucket_store_chunk_pool_returned_bytes_total. #4996
[CHANGE] Compactor: change default of -compactor.partial-block-deletion-delay to 1d. This will automatically clean up partial blocks that were a result of failed block upload or deletion. #5026
[CHANGE] Compactor: the deprecated configuration parameter -compactor.consistency-delay has been removed. #5050
[CHANGE] Store-gateway: the deprecated configuration parameter -blocks-storage.bucket-store.consistency-delay has been removed. #5050
[CHANGE] The configuration parameter -blocks-storage.bucket-store.bucket-index.enabled has been deprecated and will be removed in Mimir 2.11. Mimir is running by default with the bucket index enabled since version 2.0, and starting from the version 2.11 it will not be possible to disable it. #5051
[CHANGE] The configuration parameters -querier.iterators and -query.batch-iterators have been deprecated and will be removed in Mimir 2.11. Mimir runs by default with -querier.batch-iterators=true, and starting from version 2.11 it will not be possible to change this. #5114
[CHANGE] Compactor: change default of -compactor.first-level-compaction-wait-period to 25m. #5128
[CHANGE] Ruler: changed default of -ruler.poll-interval from 1m to 10m. Starting from this release, the configured rule groups will also be re-synced each time they're modified calling the ruler configuration API. #5170
[FEATURE] Query-frontend: add -query-frontend.log-query-request-headers to enable logging of request headers in query logs. #5030
[FEATURE] Store-gateway: add experimental feature to retain lazy-loaded index headers between restarts by eagerly loading them during startup. This is disabled by default and can only be enabled if lazy loading is enabled. To enable this set the following: #5606
- -blocks-storage.bucket-store.index-header-lazy-loading-enabled must be set to true
- -blocks-storage.bucket-store.index-header.eager-loading-startup-enabled must be set to true
[ENHANCEMENT] Add per-tenant limit -validation.max-native-histogram-buckets to be able to ignore native histogram samples that have too many buckets. #4765
[ENHANCEMENT] Store-gateway: reduce memory usage in some LabelValues calls. #4789
[ENHANCEMENT] Store-gateway: add a stage label to the metric cortex_bucket_store_series_data_touched. This label now applies to data_type="chunks" and data_type="series". The stage label has 2 values: processed - the number of series that parsed - and returned - the number of series selected from the processed bytes to satisfy the query. #4797 #4830
[ENHANCEMENT] Distributor: make __meta_tenant_id label available in relabeling rules configured via metric_relabel_configs. #4725
[ENHANCEMENT] Compactor: added the configurable limit compactor.block-upload-max-block-size-bytes or compactor_block_upload_max_block_size_bytes to limit the byte size of uploaded or validated blocks. #4680
[ENHANCEMENT] Querier: reduce CPU utilisation when shuffle sharding is enabled with large shard sizes. #4851
[ENHANCEMENT] Packaging: facilitate configuration management by instructing systemd to start mimir with a configuration file. #4810
[ENHANCEMENT] Store-gateway: reduce memory allocations when looking up postings from cache. #4861 #4869 #4962 #5047
[ENHANCEMENT] Store-gateway: retain only necessary bytes when reading series from the bucket. #4926
[ENHANCEMENT] Ingester, store-gateway: clear the shutdown marker after a successful shutdown to enable reusing their persistent volumes in case the ingester or store-gateway is restarted. #4985
[ENHANCEMENT] Store-gateway, query-frontend: Reduced memory allocations when looking up cached entries from Memcached. #4862
[ENHANCEMENT] Alertmanager: Add additional template function queryFromGeneratorURL returning query URL decoded query from the GeneratorURL field of an alert. #4301
[ENHANCEMENT] Ruler: added experimental ruler storage cache support. The cache should reduce the number of "list objects" API calls issued to the object storage when there are 2+ ruler replicas running in a Mimir cluster. The cache can be configured setting -ruler-storage.cache.* CLI flags or their respective YAML config options. #4950 #5054
[ENHANCEMENT] Store-gateway: added HTTP /store-gateway/prepare-shutdown endpoint for gracefully scaling down of store-gateways. A gauge cortex_store_gateway_prepare_shutdown_requested has been introduced for tracing this process. #4955
[ENHANCEMENT] Updated Kuberesolver dependency (github.com/sercand/kuberesolver) from v2.4.0 to v4.0.0 and gRPC dependency (google.golang.org/grpc) from v1.47.0 to v1.53.0. #4922
[ENHANCEMENT] Introduced new options for logging HTTP request headers: -server.log-request-headers enables logging HTTP request headers, -server.log-request-headers-exclude-list lists headers which should not be logged. #4922
[ENHANCEMENT] Block upload: /api/v1/upload/block/{block}/files endpoint now disables read and write HTTP timeout, overriding -server.http-read-timeout and -server.http-write-timeout values. This is done to allow large file uploads to succeed. #4956
[ENHANCEMENT] Alertmanager: Introduce new metrics from upstream. #4918
- cortex_alertmanager_notifications_failed_total (added reason label)
- cortex_alertmanager_nflog_maintenance_total
- cortex_alertmanager_nflog_maintenance_errors_total
- cortex_alertmanager_silences_maintenance_total
- cortex_alertmanager_silences_maintenance_errors_total
[ENHANCEMENT] Add native histogram support for cortex_request_duration_seconds metric family. #4987
[ENHANCEMENT] Ruler: do not list rule groups in the object storage for disabled tenants. #5004
[ENHANCEMENT] Query-frontend and querier: add HTTP API endpoint <prometheus-http-prefix>/api/v1/format_query to format a PromQL query. #4373
[ENHANCEMENT] Query-frontend: Add cortex_query_frontend_regexp_matcher_count and cortex_query_frontend_regexp_matcher_optimized_count metrics to track optimization of regular expression label matchers. #4813
[ENHANCEMENT] Alertmanager: Add configuration option to enable or disable the deletion of alertmanager state from object storage. This is useful when migrating alertmanager tenants from one cluster to another, because it avoids a condition where the state object is copied but then deleted before the configuration object is copied. #4989
[ENHANCEMENT] Querier: only use the minimum set of chunks from ingesters when querying, and cancel unnecessary requests to ingesters sooner if we know their results won't be used. #5016
[ENHANCEMENT] Add -enable-go-runtime-metrics flag to expose all go runtime metrics as Prometheus metrics. #5009
[ENHANCEMENT] Ruler: trigger a synchronization of tenant's rule groups as soon as they change the rules configuration via API. This synchronization is in addition of the periodic syncing done every -ruler.poll-interval. The new behavior is enabled by default, but can be disabled with -ruler.sync-rules-on-changes-enabled=false (configurable on a per-tenant basis too). If you disable the new behaviour, then you may want to revert -ruler.poll-interval to 1m. #4975 #5053 #5115 #5170
[ENHANCEMENT] Distributor: Improve invalid tenant shard size error message. #5024
[ENHANCEMENT] Store-gateway: record index header loading time separately in cortex_bucket_store_series_request_stage_duration_seconds{stage="load_index_header"}. Now index header loading will be visible in the "Mimir / Queries" dashboard in the "Series request p99/average latency" panels. #5011 #5062
[ENHANCEMENT] Querier and ingester: add experimental support for streaming chunks from ingesters to queriers while evaluating queries. This can be enabled with -querier.prefer-streaming-chunks=true. #4886 #5078 #5094 #5126
[ENHANCEMENT] Update Docker base images from alpine:3.17.3 to alpine:3.18.0. #5065
[ENHANCEMENT] Compactor: reduced the number of "object exists" API calls issued by the compactor to the object storage when syncing block's meta.json files. #5063
[ENHANCEMENT] Distributor: Push request rate limits (-distributor.request-rate-limit and -distributor.request-burst-size) and their associated YAML configuration are now stable. #5124
[ENHANCEMENT] Go: updated to 1.20.5. #5185
[ENHANCEMENT] Update alpine base image to 3.18.2. #5274 #5276
[BUGFIX] Metadata API: Mimir will now return an empty object when no metadata is available, matching Prometheus. #4782
[BUGFIX] Store-gateway: add collision detection on expanded postings and individual postings cache keys. #4770
[BUGFIX] Ruler: Support the type=alert|record query parameter for the API endpoint <prometheus-http-prefix>/api/v1/rules. #4302
[BUGFIX] Backend: Check that alertmanager's data-dir doesn't overlap with bucket-sync dir. #4921
[BUGFIX] Alertmanager: Allow to rate-limit webex, telegram and discord notifications. #4979
[BUGFIX] Store-gateway: panics when decoding LabelValues responses that contain more than 655360 values. These responses are no longer cached. #5021
[BUGFIX] Querier: don't leak memory when processing query requests from query-frontends (ie. when the query-scheduler is disabled). #5199

Documentation

[ENHANCEMENT] Improve MimirIngesterReachingTenantsLimit runbook. #4744 #4752
[ENHANCEMENT] Add symbol table size exceeds case to MimirCompactorHasNotSuccessfullyRunCompaction runbook. #4945
[ENHANCEMENT] Clarify which APIs use query sharding. #4948

Mixin

[CHANGE] Alerts: Remove MimirQuerierHighRefetchRate. #4980
[CHANGE] Alerts: Remove MimirTenantHasPartialBlocks. This is obsoleted by the changed default of -compactor.partial-block-deletion-delay to 1d, which will auto remediate this alert. #5026
[ENHANCEMENT] Alertmanager dashboard: display active aggregation groups #4772
[ENHANCEMENT] Alerts: MimirIngesterTSDBWALCorrupted now only fires when there are more than one corrupted WALs in single-zone deployments and when there are more than two zones affected in multi-zone deployments. #4920
[ENHANCEMENT] Alerts: added labels to duplicated MimirRolloutStuck and MimirCompactorHasNotUploadedBlocks rules in order to distinguish them. #5023
[ENHANCEMENT] Dashboards: fix holes in graph for lightly loaded clusters #4915
[ENHANCEMENT] Dashboards: allow configuring additional services for the Rollout Progress dashboard. #5007
[ENHANCEMENT] Alerts: do not fire MimirAllocatingTooMuchMemory alert for any matching container outside of namespaces where Mimir is running. #5089
[BUGFIX] Dashboards: show cancelled requests in a different color to successful requests in throughput panels on dashboards. #5039
[BUGFIX] Dashboards: fix dashboard panels that showed percentages with axes from 0 to 10000%. #5084
[BUGFIX] Remove dependency on upstream Kubernetes mixin. #4732

Jsonnet

[CHANGE] Ruler: changed ruler autoscaling policy, extended scale down period from 60s to 600s. #4786
[CHANGE] Update to v0.5.0 rollout-operator. #4893
[CHANGE] Backend: add alertmanager_args to mimir-backend when running in read-write deployment mode. Remove hardcoded filesystem alertmanager storage. This moves alertmanager's data-dir to /data/alertmanager by default. #4907 #4921
[CHANGE] Remove -pdb suffix from PodDisruptionBudget names. This will create new PodDisruptionBudget resources. Make sure to prune the old resources; otherwise, rollouts will be blocked. #5109
[CHANGE] Query-frontend: enable query sharding for cardinality estimation via -query-frontend.query-sharding-target-series-per-shard by default if the results cache is enabled. #5128
[ENHANCEMENT] Ingester: configure -blocks-storage.tsdb.head-compaction-interval=15m to spread TSDB head compaction over a wider time range. #4870
[ENHANCEMENT] Ingester: configure -blocks-storage.tsdb.wal-replay-concurrency to CPU request minus 1. #4864
[ENHANCEMENT] Compactor: configure -compactor.first-level-compaction-wait-period to TSDB head compaction interval plus 10 minutes. #4872
[ENHANCEMENT] Store-gateway: set GOMEMLIMIT to the memory request value. This should reduce the likelihood the store-gateway may go out of memory, at the cost of an higher CPU utilization due to more frequent garbage collections when the memory utilization gets closer or above the configured requested memory. #4971
[ENHANCEMENT] Store-gateway: dynamically set GOMAXPROCS based on the CPU request. This should reduce the likelihood a high load on the store-gateway will slow down the entire Kubernetes node. #5104
[ENHANCEMENT] Store-gateway: add store_gateway_lazy_loading_enabled configuration option which combines disabled lazy-loading and reducing blocks sync concurrency. Reducing blocks sync concurrency improves startup times with disabled lazy loading on HDDs. #5025
[ENHANCEMENT] Update rollout-operator image to v0.6.0. #5155
[BUGFIX] Backend: configure -ruler.alertmanager-url to mimir-backend when running in read-write deployment mode. #4892
[ENHANCEMENT] Memcached: don't overwrite upsteam memcached statefulset jsonnet to allow chosing between antiAffinity and topologySpreadConstraints.

Mimirtool

[CHANGE] check rules: will fail on duplicate rules when --strict is provided. #5035
[FEATURE] sync/diff can now include/exclude namespaces based on a regular expression using --namespaces-regex and --ignore-namespaces-regex. #5100
[ENHANCEMENT] analyze prometheus: allow to specify -prometheus-http-prefix. #4966
[ENHANCEMENT] analyze grafana: allow to specify --folder-title to limit dashboards analysis based on their exact folder title. #4973

Tools

[CHANGE] copyblocks: copying between Azure Blob Storage buckets is now supported in addition to copying between Google Cloud Storage buckets. As a result, the --service flag is now required to be specified (accepted values are gcs or abs). #4756

2.8.0

Grafana Mimir

[CHANGE] Ingester: changed experimental CLI flag from -out-of-order-blocks-external-label-enabled to -ingester.out-of-order-blocks-external-label-enabled #4440
[CHANGE] Store-gateway: The following metrics have been removed: #4332
- cortex_bucket_store_series_get_all_duration_seconds
- cortex_bucket_store_series_merge_duration_seconds
[CHANGE] Ingester: changed default value of -blocks-storage.tsdb.retention-period from 24h to 13h. If you're running Mimir with a custom configuration and you're overriding -querier.query-store-after to a value greater than the default 12h then you should increase -blocks-storage.tsdb.retention-period accordingly. #4382
[CHANGE] Ingester: the configuration parameter -blocks-storage.tsdb.max-tsdb-opening-concurrency-on-startup has been deprecated and will be removed in Mimir 2.10. #4445
[CHANGE] Query-frontend: Cached results now contain timestamp which allows Mimir to check if cached results are still valid based on current TTL configured for tenant. Results cached by previous Mimir version are used until they expire from cache, which can take up to 7 days. If you need to use per-tenant TTL sooner, please flush results cache manually. #4439
[CHANGE] Ingester: the cortex_ingester_tsdb_wal_replay_duration_seconds metrics has been removed. #4465
[CHANGE] Query-frontend and ruler: use protobuf internal query result payload format by default. This feature is no longer considered experimental. #4557 #4709
[CHANGE] Ruler: reject creating federated rule groups while tenant federation is disabled. Previously the rule groups would be silently dropped during bucket sync. #4555
[CHANGE] Compactor: the /api/v1/upload/block/{block}/finish endpoint now returns a 429 status code when the compactor has reached the limit specified by -compactor.max-block-upload-validation-concurrency. #4598
[CHANGE] Compactor: when starting a block upload the maximum byte size of the block metadata provided in the request body is now limited to 1 MiB. If this limit is exceeded a 413 status code is returned. #4683
[CHANGE] Store-gateway: cache key format for expanded postings has changed. This will invalidate the expanded postings in the index cache when deployed. #4667
[FEATURE] Cache: Introduce experimental support for using Redis for results, chunks, index, and metadata caches. #4371
[FEATURE] Vault: Introduce experimental integration with Vault to fetch secrets used to configure TLS for clients. Server TLS secrets will still be read from a file. tls-ca-path, tls-cert-path and tls-key-path will denote the path in Vault for the following CLI flags when -vault.enabled is true: #4446.
- -distributor.ha-tracker.etcd.*
- -distributor.ring.etcd.*
- -distributor.forwarding.grpc-client.*
- -querier.store-gateway-client.*
- -ingester.client.*
- -ingester.ring.etcd.*
- -querier.frontend-client.*
- -query-frontend.grpc-client-config.*
- -query-frontend.results-cache.redis.*
- -blocks-storage.bucket-store.index-cache.redis.*
- -blocks-storage.bucket-store.chunks-cache.redis.*
- -blocks-storage.bucket-store.metadata-cache.redis.*
- -compactor.ring.etcd.*
- -store-gateway.sharding-ring.etcd.*
- -ruler.client.*
- -ruler.alertmanager-client.*
- -ruler.ring.etcd.*
- -ruler.query-frontend.grpc-client-config.*
- -alertmanager.sharding-ring.etcd.*
- -alertmanager.alertmanager-client.*
- -memberlist.*
- -query-scheduler.grpc-client-config.*
- -query-scheduler.ring.etcd.*
- -overrides-exporter.ring.etcd.*
[FEATURE] Distributor, ingester, querier, query-frontend, store-gateway: add experimental support for native histograms. Requires that the experimental protobuf query result response format is enabled by -query-frontend.query-result-response-format=protobuf on the query frontend. #4286 #4352 #4354 #4376 #4377 #4387 #4396 #4425 #4442 #4494 #4512 #4513 #4526
[FEATURE] Added -<prefix>.s3.storage-class flag to configure the S3 storage class for objects written to S3 buckets. #4300
[FEATURE] Add freebsd to the target OS when generating binaries for a Mimir release. #4654
[FEATURE] Ingester: Add prepare-shutdown endpoint which can be used as part of Kubernetes scale down automations. #4718
[ENHANCEMENT] Add timezone information to Alpine Docker images. #4583
[ENHANCEMENT] Ruler: Sync rules when ruler JOINING the ring instead of ACTIVE, In order to reducing missed rule iterations during ruler restarts. #4451
[ENHANCEMENT] Allow to define service name used for tracing via JAEGER_SERVICE_NAME environment variable. #4394
[ENHANCEMENT] Querier and query-frontend: add experimental, more performant protobuf query result response format enabled with -query-frontend.query-result-response-format=protobuf. #4304 #4318 #4375
[ENHANCEMENT] Compactor: added experimental configuration parameter -compactor.first-level-compaction-wait-period, to configure how long the compactor should wait before compacting 1st level blocks (uploaded by ingesters). This configuration option allows to reduce the chances compactor begins compacting blocks before all ingesters have uploaded their blocks to the storage. #4401
[ENHANCEMENT] Store-gateway: use more efficient chunks fetching and caching. #4255
[ENHANCEMENT] Query-frontend and ruler: add experimental, more performant protobuf internal query result response format enabled with -ruler.query-frontend.query-result-response-format=protobuf. #4331
[ENHANCEMENT] Ruler: increased tolerance for missed iterations on alerts, reducing the chances of flapping firing alerts during ruler restarts. #4432
[ENHANCEMENT] Optimized .* and .+ regular expression label matchers. #4432
[ENHANCEMENT] Optimized regular expression label matchers with alternates (e.g. a|b|c). #4647
[ENHANCEMENT] Added an in-memory cache for regular expression matchers, to avoid parsing and compiling the same expression multiple times when used in recurring queries. #4633
[ENHANCEMENT] Query-frontend: results cache TTL is now configurable by using -query-frontend.results-cache-ttl and -query-frontend.results-cache-ttl-for-out-of-order-time-window options. These values can also be specified per tenant. Default values are unchanged (7 days and 10 minutes respectively). #4385
[ENHANCEMENT] Ingester: added advanced configuration parameter -blocks-storage.tsdb.wal-replay-concurrency representing the maximum number of CPUs used during WAL replay. #4445
[ENHANCEMENT] Ingester: added metrics cortex_ingester_tsdb_open_duration_seconds_total to measure the total time it takes to open all existing TSDBs. The time tracked by this metric also includes the TSDBs WAL replay duration. #4465
[ENHANCEMENT] Store-gateway: use streaming implementation for LabelNames RPC. The batch size for streaming is controlled by -blocks-storage.bucket-store.batch-series-size. #4464
[ENHANCEMENT] Memcached: Add support for TLS or mTLS connections to cache servers. #4535
[ENHANCEMENT] Compactor: blocks index files are now validated for correctness for blocks uploaded via the TSDB block upload feature. #4503
[ENHANCEMENT] Compactor: block chunks and segment files are now validated for correctness for blocks uploaded via the TSDB block upload feature. #4549
[ENHANCEMENT] Ingester: added configuration options to configure the "postings for matchers" cache of each compacted block queried from ingesters: #4561
- -blocks-storage.tsdb.block-postings-for-matchers-cache-ttl
- -blocks-storage.tsdb.block-postings-for-matchers-cache-size
- -blocks-storage.tsdb.block-postings-for-matchers-cache-force
[ENHANCEMENT] Compactor: validation of blocks uploaded via the TSDB block upload feature is now configurable on a per tenant basis: #4585
- -compactor.block-upload-validation-enabled has been added, compactor_block_upload_validation_enabled can be used to override per tenant
- -compactor.block-upload.block-validation-enabled was the previous global flag and has been removed
[ENHANCEMENT] TSDB Block Upload: block upload validation concurrency can now be limited with -compactor.max-block-upload-validation-concurrency. #4598
[ENHANCEMENT] OTLP: Add support for converting OTel exponential histograms to Prometheus native histograms. The ingestion of native histograms must be enabled, please set -ingester.native-histograms-ingestion-enabled to true. #4063 #4639
[ENHANCEMENT] Query-frontend: add metric cortex_query_fetched_index_bytes_total to measure TSDB index bytes fetched to execute a query. #4597
[ENHANCEMENT] Query-frontend: add experimental limit to enforce a max query expression size in bytes via -query-frontend.max-query-expression-size-bytes or max_query_expression_size_bytes. #4604
[ENHANCEMENT] Query-tee: improve message logged when comparing responses and one response contains a non-JSON payload. #4588
[ENHANCEMENT] Distributor: add ability to set per-distributor limits via distributor_limits block in runtime configuration in addition to the existing configuration. #4619
[ENHANCEMENT] Querier: reduce peak memory consumption for queries that touch a large number of chunks. #4625
[ENHANCEMENT] Query-frontend: added experimental -query-frontend.query-sharding-max-regexp-size-bytes limit to query-frontend. When set to a value greater than 0, query-frontend disabled query sharding for any query with a regexp matcher longer than the configured limit. #4632
[ENHANCEMENT] Store-gateway: include statistics from LabelValues and LabelNames calls in cortex_bucket_store_series* metrics. #4673
[ENHANCEMENT] Query-frontend: improve readability of distributed tracing spans. #4656
[ENHANCEMENT] Update Docker base images from alpine:3.17.2 to alpine:3.17.3. #4685
[ENHANCEMENT] Querier: improve performance when shuffle sharding is enabled and the shard size is large. #4711
[ENHANCEMENT] Ingester: improve performance when Active Series Tracker is in use. #4717
[ENHANCEMENT] Store-gateway: optionally select -blocks-storage.bucket-store.series-selection-strategy, which can limit the impact of large posting lists (when many series share the same label name and value). #4667 #4695 #4698
[ENHANCEMENT] Querier: Cache the converted float histogram from chunk iterator, hence there is no need to lookup chunk every time to get the converted float histogram. #4684
[ENHANCEMENT] Ruler: Improve rule upload performance when not enforcing per-tenant rule group limits. #4828
[ENHANCEMENT] Improved memory limit on the in-memory cache used for regular expression matchers. #4751
[BUGFIX] Querier: Streaming remote read will now continue to return multiple chunks per frame after the first frame. #4423
[BUGFIX] Store-gateway: the values for stage="processed" for the metrics cortex_bucket_store_series_data_touched and cortex_bucket_store_series_data_size_touched_bytes when using fine-grained chunks caching is now reporting the correct values of chunks held in memory. #4449
[BUGFIX] Compactor: fixed reporting a compaction error when compactor is correctly shut down while populating blocks. #4580
[BUGFIX] OTLP: Do not drop exemplars of the OTLP Monotonic Sum metric. #4063
[BUGFIX] Packaging: flag /etc/default/mimir and /etc/sysconfig/mimir as config to prevent overwrite. #4587
[BUGFIX] Query-frontend: don't retry queries which error inside PromQL. #4643
[BUGFIX] Store-gateway & query-frontend: report more consistent statistics for fetched index bytes. #4671
[BUGFIX] Native histograms: fix how IsFloatHistogram determines if mimirpb.Histogram is a float histogram. #4706
[BUGFIX] Query-frontend: fix query sharding for native histograms. #4666
[BUGFIX] Ring status page: fixed the owned tokens percentage value displayed. #4730
[BUGFIX] Querier: fixed chunk iterator that can return sample with wrong timestamp. #4450
[BUGFIX] Packaging: fix preremove script preventing upgrades. #4801
[BUGFIX] Security: updates Go to version 1.20.4 to fix CVE-2023-24539, CVE-2023-24540, CVE-2023-29400. #4903

Mixin

[ENHANCEMENT] Queries: Display data touched per sec in bytes instead of number of items. #4492
[ENHANCEMENT] _config.job_names.<job> values can now be arrays of regular expressions in addition to a single string. Strings are still supported and behave as before. #4543
[ENHANCEMENT] Queries dashboard: remove mention to store-gateway "streaming enabled" in panels because store-gateway only support streaming series since Mimir 2.7. #4569
[ENHANCEMENT] Ruler: Add panel description for Read QPS panel in Ruler dashboard to explain values when in remote ruler mode. #4675
[BUGFIX] Ruler dashboard: show data for reads from ingesters. #4543
[BUGFIX] Pod selector regex for deployments: change (.*-mimir-) to (.*mimir-). #4603

Jsonnet

[CHANGE] Ruler: changed ruler deployment max surge from 0 to 50%, and max unavailable from 1 to 0. #4381
[CHANGE] Memcached connections parameters -blocks-storage.bucket-store.index-cache.memcached.max-idle-connections, -blocks-storage.bucket-store.chunks-cache.memcached.max-idle-connections and -blocks-storage.bucket-store.metadata-cache.memcached.max-idle-connections settings are now configured based on max-get-multi-concurrency and max-async-concurrency. #4591
[CHANGE] Add support to use external Redis as cache. Following are some changes in the jsonnet config: #4386 #4640
- Renamed memcached_*_enabled config options to cache_*_enabled
- Renamed memcached_*_max_item_size_mb config options to cache_*_max_item_size_mb
- Added cache_*_backend config options
[CHANGE] Store-gateway StatefulSets with disabled multi-zone deployment are also unregistered from the ring on shutdown. This eliminated resharding during rollouts, at the cost of extra effort during scaling down store-gateways. For more information see Scaling down store-gateways. #4713
[CHANGE] Removed $._config.querier.replicas and $._config.queryFrontend.replicas. If you need to customize the number of querier or query-frontend replicas, and autoscaling is disabled, please set an override as is done for other stateless components (e.g. distributors). #5130
[ENHANCEMENT] Alertmanager: add alertmanager_data_disk_size and alertmanager_data_disk_class configuration options, by default no storage class is set. #4389
[ENHANCEMENT] Update rollout-operator to v0.4.0. #4524
[ENHANCEMENT] Update memcached to memcached:1.6.19-alpine. #4581
[ENHANCEMENT] Add support for mTLS connections to Memcached servers. #4553
[ENHANCEMENT] Update the memcached-exporter to v0.11.2. #4570
[ENHANCEMENT] Autoscaling: Add autoscaling_query_frontend_memory_target_utilization, autoscaling_ruler_query_frontend_memory_target_utilization, and autoscaling_ruler_memory_target_utilization configuration options, for controlling the corresponding autoscaler memory thresholds. Each has a default of 1, i.e. 100%. #4612
[ENHANCEMENT] Distributor: add ability to set per-distributor limits via distributor_instance_limits using runtime configuration. #4627
[BUGFIX] Add missing query sharding settings for user_24M and user_32M plans. #4374

Mimirtool

[ENHANCEMENT] Backfill: mimirtool will now sleep and retry if it receives a 429 response while trying to finish an upload due to validation concurrency limits. #4598
[ENHANCEMENT] gauge panel type is supported now in mimirtool analyze dashboard. #4679
[ENHANCEMENT] Set a User-Agent header on requests to Mimir or Prometheus servers. #4700

Mimir Continuous Test

[FEATURE] Allow continuous testing of native histograms as well by enabling the flag -tests.write-read-series-test.histogram-samples-enabled. The metrics exposed by the tool will now have a new label called type with possible values of float, histogram_float_counter, histogram_float_gauge, histogram_int_counter, histogram_int_gauge, the list of metrics impacted: #4457
- mimir_continuous_test_writes_total
- mimir_continuous_test_writes_failed_total
- mimir_continuous_test_queries_total
- mimir_continuous_test_queries_failed_total
- mimir_continuous_test_query_result_checks_total
- mimir_continuous_test_query_result_checks_failed_total
[ENHANCEMENT] Added a new metric mimir_continuous_test_build_info that reports version information, similar to the existing cortex_build_info metric exposed by other Mimir components. #4712
[ENHANCEMENT] Add coherency for the selected ranges and instants of test queries. #4704

Query-tee

Documentation

[CHANGE] Clarify what deprecation means in the lifecycle of configuration parameters. #4499
[CHANGE] Update compactor split-groups and split-and-merge-shards recommendation on component page. #4623
[FEATURE] Add instructions about how to configure native histograms. #4527
[ENHANCEMENT] Runbook for MimirCompactorHasNotSuccessfullyRunCompaction extended to include scenario where compaction has fallen behind. #4609
[ENHANCEMENT] Add explanation for QPS values for reads in remote ruler mode and writes generally, to the Ruler dashboard page. #4629
[ENHANCEMENT] Expand zone-aware replication page to cover single physical availability zone deployments. #4631
[FEATURE] Add instructions to use puppet module. #4610
[FEATURE] Add documentation on how deploy mixin with terraform. #4161

Tools

[ENHANCEMENT] tsdb-index: iteration over index is now faster when any equal matcher is supplied. #4515

2.7.3

Grafana Mimir

[BUGFIX] Security: updates Go to version 1.20.4 to fix CVE-2023-24539, CVE-2023-24540, CVE-2023-29400. #4905

2.7.2

Grafana Mimir

[BUGFIX] Security: updated Go version to 1.20.3 to fix CVE-2023-24538 #4795

2.7.1

Note: During the release process, version 2.7.0 was tagged too early, before completing the release checklist and production testing. Release 2.7.1 doesn't include any code changes since 2.7.0, but now has proper release notes, published documentation, and has been fully tested in our production environment.

Grafana Mimir

[CHANGE] Ingester: the configuration parameter -ingester.ring.readiness-check-ring-health has been deprecated and will be removed in Mimir 2.9. #4422
[CHANGE] Ruler: changed default value of -ruler.evaluation-delay-duration option from 0 to 1m. #4250
[CHANGE] Querier: Errors with status code 422 coming from the store-gateway are propagated and not converted to the consistency check error anymore. #4100
[CHANGE] Store-gateway: When a query hits max_fetched_chunks_per_query and max_fetched_series_per_query limits, an error with the status code 422 is created and returned. #4056
[CHANGE] Packaging: Migrate FPM packaging solution to NFPM. Rationalize packages dependencies and add package for all binaries. #3911
[CHANGE] Store-gateway: Deprecate flag -blocks-storage.bucket-store.chunks-cache.subrange-size since there's no benefit to changing the default of 16000. #4135
[CHANGE] Experimental support for ephemeral storage introduced in Mimir 2.6.0 has been removed. Following options are no longer available: #4252
- -blocks-storage.ephemeral-tsdb.*
- -distributor.ephemeral-series-enabled
- -distributor.ephemeral-series-matchers
- -ingester.max-ephemeral-series-per-user
- -ingester.instance-limits.max-ephemeral-series Querying with using {__mimir_storage__="ephemeral"} selector no longer works. All label values with ephemeral- prefix in reason label of cortex_discarded_samples_total metric are no longer available. Following metrics have been removed:
- cortex_ingester_ephemeral_series
- cortex_ingester_ephemeral_series_created_total
- cortex_ingester_ephemeral_series_removed_total
- cortex_ingester_ingested_ephemeral_samples_total
- cortex_ingester_ingested_ephemeral_samples_failures_total
- cortex_ingester_memory_ephemeral_users
- cortex_ingester_queries_ephemeral_total
- cortex_ingester_queried_ephemeral_samples
- cortex_ingester_queried_ephemeral_series
[CHANGE] Store-gateway: use mmap-less index-header reader by default and remove mmap-based index header reader. The following flags have changed: #4280
- -blocks-storage.bucket-store.index-header.map-populate-enabled has been removed
- -blocks-storage.bucket-store.index-header.stream-reader-enabled has been removed
- -blocks-storage.bucket-store.index-header.stream-reader-max-idle-file-handles has been renamed to -blocks-storage.bucket-store.index-header.max-idle-file-handles, and the corresponding configuration file option has been renamed from stream_reader_max_idle_file_handles to max_idle_file_handles
[CHANGE] Store-gateway: the streaming store-gateway is now enabled by default. The new default setting for -blocks-storage.bucket-store.batch-series-size is 5000. #4330
[CHANGE] Compactor: the configuration parameter -compactor.consistency-delay has been deprecated and will be removed in Mimir 2.9. #4409
[CHANGE] Store-gateway: the configuration parameter -blocks-storage.bucket-store.consistency-delay has been deprecated and will be removed in Mimir 2.9. #4409
[FEATURE] Ruler: added keep_firing_for support to alerting rules. #4099
[FEATURE] Distributor, ingester: ingestion of native histograms. The new per-tenant limit -ingester.native-histograms-ingestion-enabled controls whether native histograms are stored or ignored. #4159
[FEATURE] Query-frontend: Introduce experimental -query-frontend.query-sharding-target-series-per-shard to allow query sharding to take into account cardinality of similar requests executed previously. This feature uses the same cache that's used for results caching. #4121 #4177 #4188 #4254
[ENHANCEMENT] Go: update go to 1.20.1. #4266
[ENHANCEMENT] Ingester: added out_of_order_blocks_external_label_enabled shipper option to label out-of-order blocks before shipping them to cloud storage. #4182 #4297
[ENHANCEMENT] Ruler: introduced concurrency when loading per-tenant rules configuration. This improvement is expected to speed up the ruler start up time in a Mimir cluster with a large number of tenants. #4258
[ENHANCEMENT] Compactor: Add reason label to cortex_compactor_runs_failed_total. The value can be shutdown or error. #4012
[ENHANCEMENT] Store-gateway: enforce max_fetched_series_per_query. #4056
[ENHANCEMENT] Query-frontend: Disambiguate logs for failed queries. #4067
[ENHANCEMENT] Query-frontend: log caller user agent in query stats logs. #4093
[ENHANCEMENT] Store-gateway: add data_type label with values on cortex_bucket_store_partitioner_extended_ranges_total, cortex_bucket_store_partitioner_expanded_ranges_total, cortex_bucket_store_partitioner_requested_ranges_total, cortex_bucket_store_partitioner_expanded_bytes_total, cortex_bucket_store_partitioner_requested_bytes_total for postings, series, and chunks. #4095
[ENHANCEMENT] Store-gateway: Reduce memory allocation rate when loading TSDB chunks from Memcached. #4074
[ENHANCEMENT] Query-frontend: track cortex_frontend_query_response_codec_duration_seconds and cortex_frontend_query_response_codec_payload_bytes metrics to measure the time taken and bytes read / written while encoding and decoding query result payloads. #4110
[ENHANCEMENT] Alertmanager: expose additional upstream metrics cortex_alertmanager_dispatcher_aggregation_groups, cortex_alertmanager_dispatcher_alert_processing_duration_seconds. #4151
[ENHANCEMENT] Querier and query-frontend: add experimental, more performant protobuf internal query result response format enabled with -query-frontend.query-result-response-format=protobuf. #4153
[ENHANCEMENT] Store-gateway: use more efficient chunks fetching and caching. This should reduce CPU, memory utilization, and receive bandwidth of a store-gateway. Enable with -blocks-storage.bucket-store.chunks-cache.fine-grained-chunks-caching-enabled=true. #4163 #4174 #4227
[ENHANCEMENT] Query-frontend: Wait for in-flight queries to finish before shutting down. #4073 #4170
[ENHANCEMENT] Store-gateway: added encode and other stage to cortex_bucket_store_series_request_stage_duration_seconds metric. #4179
[ENHANCEMENT] Ingester: log state of TSDB when shipping or forced compaction can't be done due to unexpected state of TSDB. #4211
[ENHANCEMENT] Update Docker base images from alpine:3.17.1 to alpine:3.17.2. #4240
[ENHANCEMENT] Store-gateway: add a stage label to the metrics cortex_bucket_store_series_data_fetched, cortex_bucket_store_series_data_size_fetched_bytes, cortex_bucket_store_series_data_touched, cortex_bucket_store_series_data_size_touched_bytes. This label only applies to data_type="chunks". For fetched metrics with data_type="chunks" the stage label has 2 values: fetched - the chunks or bytes that were fetched from the cache or the object store, refetched - the chunks or bytes that had to be refetched from the cache or the object store because their size was underestimated during the first fetch. For touched metrics with data_type="chunks" the stage label has 2 values: processed - the chunks or bytes that were read from the fetched chunks or bytes and were processed in memory, returned - the chunks or bytes that were selected from the processed bytes to satisfy the query. #4227 #4316
[ENHANCEMENT] Compactor: improve the partial block check related to compactor.partial-block-deletion-delay to potentially issue less requests to object storage. #4246
[ENHANCEMENT] Memcached: added -*.memcached.min-idle-connections-headroom-percentage support to configure the minimum number of idle connections to keep open as a percentage (0-100) of the number of recently used idle connections. This feature is disabled when set to a negative value (default), which means idle connections are kept open indefinitely. #4249
[ENHANCEMENT] Querier and store-gateway: optimized regular expression label matchers with case insensitive alternate operator. #4340 #4357
[ENHANCEMENT] Compactor: added the experimental flag -compactor.block-upload.block-validation-enabled with the default true to configure whether block validation occurs on backfilled blocks. #3411
[ENHANCEMENT] Ingester: apply a jitter to the first TSDB head compaction interval configured via -blocks-storage.tsdb.head-compaction-interval. Subsequent checks will happen at the configured interval. This should help to spread the TSDB head compaction among different ingesters over the configured interval. #4364
[ENHANCEMENT] Ingester: the maximum accepted value for -blocks-storage.tsdb.head-compaction-interval has been increased from 5m to 15m. #4364
[BUGFIX] Store-gateway: return Canceled rather than Aborted or Internal error when the calling querier cancels a label names or values request, and return Internal if processing the request fails for another reason. #4061
[BUGFIX] Querier: track canceled requests with status code 499 in the metrics instead of 503 or 422. #4099
[BUGFIX] Ingester: compact out-of-order data during /ingester/flush or when TSDB is idle. #4180
[BUGFIX] Ingester: conversion of global limits max-series-per-user, max-series-per-metric, max-metadata-per-user and max-metadata-per-metric into corresponding local limits now takes into account the number of ingesters in each zone. #4238
[BUGFIX] Ingester: track cortex_ingester_memory_series metric consistently with cortex_ingester_memory_series_created_total and cortex_ingester_memory_series_removed_total. #4312
[BUGFIX] Querier: fixed a bug which was incorrectly matching series with regular expression label matchers with begin/end anchors in the middle of the regular expression. #4340

Mixin

[CHANGE] Move auto-scaling panel rows down beneath logical network path in Reads and Writes dashboards. #4049
[CHANGE] Make distributor auto-scaling metric panels show desired number of replicas. #4218
[CHANGE] Alerts: The alert MimirMemcachedRequestErrors has been renamed to MimirCacheRequestErrors. #4242
[ENHANCEMENT] Alerts: Added MimirAutoscalerKedaFailing alert firing when a KEDA scaler is failing. #4045
[ENHANCEMENT] Add auto-scaling panels to ruler dashboard. #4046
[ENHANCEMENT] Add gateway auto-scaling panels to Reads and Writes dashboards. #4049 #4216
[ENHANCEMENT] Dashboards: distinguish between label names and label values queries. #4065
[ENHANCEMENT] Add query-frontend and ruler-query-frontend auto-scaling panels to Reads and Ruler dashboards. #4199
[BUGFIX] Alerts: Fixed MimirAutoscalerNotActive to not fire if scaling metric does not exist, to avoid false positives on scaled objects with 0 min replicas. #4045
[BUGFIX] Alerts: MimirCompactorHasNotSuccessfullyRunCompaction is no longer triggered by frequent compactor restarts. #4012
[BUGFIX] Tenants dashboard: Correctly show the ruler-query-scheduler queue size. #4152

Jsonnet

[CHANGE] Create the query-frontend-discovery service only when Mimir is deployed in microservice mode without query-scheduler. #4353
[CHANGE] Add results cache backend config to ruler-query-frontend configuration to allow cache reuse for cardinality-estimation based sharding. #4257
[ENHANCEMENT] Add support for ruler auto-scaling. #4046
[ENHANCEMENT] Add optional weight param to newQuerierScaledObject and newRulerQuerierScaledObject to allow running multiple querier deployments on different node types. #4141
[ENHANCEMENT] Add support for query-frontend and ruler-query-frontend auto-scaling. #4199
[BUGFIX] Shuffle sharding: when applying user class limits, honor the minimum shard size configured in $._config.shuffle_sharding.*. #4363

Mimirtool

[FEATURE] Added keep_firing_for support to rules configuration. #4099
[ENHANCEMENT] Add -tls-insecure-skip-verify to rules, alertmanager and backfill commands. #4162

Query-tee

[CHANGE] Increase default value of -backend.read-timeout to 150s, to accommodate default querier and query frontend timeout of 120s. #4262
[ENHANCEMENT] Log errors that occur while performing requests to compare two endpoints. #4262
[ENHANCEMENT] When comparing two responses that both contain an error, only consider the comparison failed if the errors differ. Previously, if either response contained an error, the comparison always failed, even if both responses contained the same error. #4262
[ENHANCEMENT] Include the value of the X-Scope-OrgID header when logging a comparison failure. #4262
[BUGFIX] Parameters (expression, time range etc.) for a query request where the parameters are in the HTTP request body rather than in the URL are now logged correctly when responses differ. #4265

Documentation

[ENHANCEMENT] Add guide on alternative migration method for Thanos to Mimir #3554
[ENHANCEMENT] Restore "Migrate from Cortex" for Jsonnet. #3929
[ENHANCEMENT] Document migration from microservices to read-write deployment mode. #3951
[ENHANCEMENT] Do not error when there is nothing to commit as part of a publish #4058
[ENHANCEMENT] Explain how to run Mimir locally using docker-compose #4079
[ENHANCEMENT] Docs: use long flag names in runbook commands. #4088
[ENHANCEMENT] Clarify how ingester replication happens. #4101
[ENHANCEMENT] Improvements to the Get Started guide. #4315
[BUGFIX] Added indentation to Azure and SWIFT backend definition. #4263

Tools

[ENHANCEMENT] Adapt tsdb-print-chunk for native histograms. #4186
[ENHANCEMENT] Adapt tsdb-index-health for blocks containing native histograms. #4186
[ENHANCEMENT] Adapt tsdb-chunks tool to handle native histograms. #4186

2.6.2

[BUGFIX] Security: updates Go to version 1.20.4 to fix CVE-2023-24539, CVE-2023-24540, CVE-2023-29400. #4903

2.6.1

Grafana Mimir

[BUGFIX] Security: updates Go to version 1.20.3 to fix CVE-2023-24538 #4798

2.6.0

Grafana Mimir

[CHANGE] Querier: Introduce -querier.max-partial-query-length to limit the time range for partial queries at the querier level and deprecate -store.max-query-length. #3825 #4017
[CHANGE] Store-gateway: Remove experimental -blocks-storage.bucket-store.max-concurrent-reject-over-limit flag. #3706
[CHANGE] Ingester: If shipping is enabled block retention will now be relative to the upload time to cloud storage. If shipping is disabled block retention will be relative to the creation time of the block instead of the mintime of the last block created. #3816
[CHANGE] Query-frontend: Deprecated CLI flag -query-frontend.align-querier-with-step has been removed. #3982
[CHANGE] Alertmanager: added default configuration for -alertmanager.configs.fallback. Allows tenants to send alerts without first uploading an Alertmanager configuration. #3541
[FEATURE] Store-gateway: streaming of series. The store-gateway can now stream results back to the querier instead of buffering them. This is expected to greatly reduce peak memory consumption while keeping latency the same. You can enable this feature by setting -blocks-storage.bucket-store.batch-series-size to a value in the high thousands (5000-10000). This is still an experimental feature and is subject to a changing API and instability. #3540 #3546 #3587 #3606 #3611 #3620 #3645 #3355 #3697 #3666 #3687 #3728 #3739 #3751 #3779 #3839
[FEATURE] Alertmanager: Added support for the Webex receiver. #3758
[FEATURE] Limits: Added the -validation.separate-metrics-group-label flag. This allows further separation of the cortex_discarded_samples_total metric by an additional group label - which is configured by this flag to be the value of a specific label on an incoming timeseries. Active groups are tracked and inactive groups are cleaned up on a defined interval. The maximum number of groups tracked is controlled by the -max-separate-metrics-groups-per-user flag. #3439
[FEATURE] Overrides-exporter: Added experimental ring support to overrides-exporter via -overrides-exporter.ring.enabled. When enabled, the ring is used to establish a leader replica for the export of limit override metrics. #3908 #3953
[FEATURE] Ephemeral storage (experimental): Mimir can now accept samples into "ephemeral storage". Such samples are available for querying for a short amount of time (-blocks-storage.ephemeral-tsdb.retention-period, defaults to 10 minutes), and then removed from memory. To use ephemeral storage, distributor must be configured with -distributor.ephemeral-series-enabled option. Series matching -distributor.ephemeral-series-matchers will be marked for storing into ephemeral storage in ingesters. Each tenant needs to have ephemeral storage enabled by using -ingester.max-ephemeral-series-per-user limit, which defaults to 0 (no ephemeral storage). Ingesters have new -ingester.instance-limits.max-ephemeral-series limit for total number of series in ephemeral storage across all tenants. If ingestion of samples into ephemeral storage fails, cortex_discarded_samples_total metric will use values prefixed with ephemeral- for reason label. Querying of ephemeral storage is possible by using {__mimir_storage__="ephemeral"} as metric selector. Following new metrics related to ephemeral storage are introduced: #3897 #3922 #3961 #3997 #4004
- cortex_ingester_ephemeral_series
- cortex_ingester_ephemeral_series_created_total
- cortex_ingester_ephemeral_series_removed_total
- cortex_ingester_ingested_ephemeral_samples_total
- cortex_ingester_ingested_ephemeral_samples_failures_total
- cortex_ingester_memory_ephemeral_users
- cortex_ingester_queries_ephemeral_total
- cortex_ingester_queried_ephemeral_samples
- cortex_ingester_queried_ephemeral_series
[ENHANCEMENT] Added new metric thanos_shipper_last_successful_upload_time: Unix timestamp (in seconds) of the last successful TSDB block uploaded to the bucket. #3627
[ENHANCEMENT] Ruler: Added -ruler.alertmanager-client.tls-enabled configuration for alertmanager client. #3432 #3597
[ENHANCEMENT] Activity tracker logs now have component=activity-tracker label. #3556
[ENHANCEMENT] Distributor: remove labels with empty values #2439
[ENHANCEMENT] Query-frontend: track query HTTP requests in the Activity Tracker. #3561
[ENHANCEMENT] Store-gateway: Add experimental alternate implementation of index-header reader that does not use memory mapped files. The index-header reader is expected to improve stability of the store-gateway. You can enable this implementation with the flag -blocks-storage.bucket-store.index-header.stream-reader-enabled. #3639 #3691 #3703 #3742 #3785 #3787 #3797
[ENHANCEMENT] Query-scheduler: add cortex_query_scheduler_cancelled_requests_total metric to track the number of requests that are already cancelled when dequeued. #3696
[ENHANCEMENT] Store-gateway: add cortex_bucket_store_partitioner_extended_ranges_total metric to keep track of the ranges that the partitioner decided to overextend and merge in order to save API call to the object storage. #3769
[ENHANCEMENT] Compactor: Auto-forget unhealthy compactors after ten failed ring heartbeats. #3771
[ENHANCEMENT] Ruler: change default value of -ruler.for-grace-period from 10m to 2m and update help text. The new default value reflects how we operate Mimir at Grafana Labs. #3817
[ENHANCEMENT] Ingester: Added experimental flags to force usage of postings for matchers cache. These flags will be removed in the future and it's not recommended to change them. #3823
- -blocks-storage.tsdb.head-postings-for-matchers-cache-ttl
- -blocks-storage.tsdb.head-postings-for-matchers-cache-size
- -blocks-storage.tsdb.head-postings-for-matchers-cache-force
[ENHANCEMENT] Ingester: Improved series selection performance when some of the matchers do not match any series. #3827
[ENHANCEMENT] Alertmanager: Add new additional template function tenantID returning id of the tenant owning the alert. #3758
[ENHANCEMENT] Alertmanager: Add additional template function grafanaExploreURL returning URL to grafana explore with range query. #3849
[ENHANCEMENT] Reduce overhead of debug logging when filtered out. #3875
[ENHANCEMENT] Update Docker base images from alpine:3.16.2 to alpine:3.17.1. #3898
[ENHANCEMENT] Ingester: Add new /ingester/tsdb_metrics endpoint to return tenant-specific TSDB metrics. #3923
[ENHANCEMENT] Query-frontend: CLI flag -query-frontend.max-total-query-length and its associated YAML configuration is now stable. #3882
[ENHANCEMENT] Ruler: rule groups now support optional and experimental align_evaluation_time_on_interval field, which causes all evaluations to happen on interval-aligned timestamp. #4013
[ENHANCEMENT] Query-scheduler: ring-based service discovery is now stable. #4028
[ENHANCEMENT] Store-gateway: improved performance of prefix matching on the labels. #4055 #4080
[BUGFIX] Log the names of services that are not yet running rather than unsupported value type when calling /ready and some services are not running. #3625
[BUGFIX] Alertmanager: Fix template spurious deletion with relative data dir. #3604
[BUGFIX] Security: update prometheus/exporter-toolkit for CVE-2022-46146. #3675
[BUGFIX] Security: update golang.org/x/net for CVE-2022-41717. #3755
[BUGFIX] Debian package: Fix post-install, environment file path and user creation. #3720
[BUGFIX] memberlist: Fix panic during Mimir startup when Mimir receives gossip message before it's ready. #3746
[BUGFIX] Store-gateway: fix cortex_bucket_store_partitioner_requested_bytes_total metric to not double count overlapping ranges. #3769
[BUGFIX] Update github.com/thanos-io/objstore to address issue with Multipart PUT on s3-compatible Object Storage. #3802 #3821
[BUGFIX] Distributor, Query-scheduler: Make sure ring metrics include a cortex_ prefix as expected by dashboards. #3809
[BUGFIX] Querier: canceled requests are no longer reported as "consistency check" failures. #3837 #3927
[BUGFIX] Distributor: don't panic when metric_relabel_configs in overrides contains null element. #3868
[BUGFIX] Distributor: don't panic when OTLP histograms don't have any buckets. #3853
[BUGFIX] Ingester, Compactor: fix panic that can occur when compaction fails. #3955
[BUGFIX] Store-gateway: return Canceled rather than Aborted error when the calling querier cancels the request. #4007

Mixin

[ENHANCEMENT] Alerts: Added MimirIngesterInstanceHasNoTenants alert that fires when an ingester replica is not receiving write requests for any tenant. #3681
[ENHANCEMENT] Alerts: Extended MimirAllocatingTooMuchMemory to check read-write deployment containers. #3710
[ENHANCEMENT] Alerts: Added MimirAlertmanagerInstanceHasNoTenants alert that fires when an alertmanager instance ows no tenants. #3826
[ENHANCEMENT] Alerts: Added MimirRulerInstanceHasNoRuleGroups alert that fires when a ruler replica is not assigned any rule group to evaluate. #3723
[ENHANCEMENT] Support for baremetal deployment for alerts and scaling recording rules. #3719
[ENHANCEMENT] Dashboards: querier autoscaling now supports multiple scaled objects (configurable via $._config.autoscale.querier.hpa_name). #3962
[BUGFIX] Alerts: Fixed MimirIngesterRestarts alert when Mimir is deployed in read-write mode. #3716
[BUGFIX] Alerts: Fixed MimirIngesterHasNotShippedBlocks and MimirIngesterHasNotShippedBlocksSinceStart alerts for when Mimir is deployed in read-write or monolithic modes and updated them to use new thanos_shipper_last_successful_upload_time metric. #3627
[BUGFIX] Alerts: Fixed MimirMemoryMapAreasTooHigh alert when Mimir is deployed in read-write mode. #3626
[BUGFIX] Alerts: Fixed MimirCompactorSkippedBlocksWithOutOfOrderChunks matching on non-existent label. #3628
[BUGFIX] Dashboards: Fix Rollout Progress dashboard incorrectly using Gateway metrics when Gateway was not enabled. #3709
[BUGFIX] Tenants dashboard: Make it compatible with all deployment types. #3754
[BUGFIX] Alerts: Fixed MimirCompactorHasNotUploadedBlocks to not fire if compactor has nothing to do. #3793
[BUGFIX] Alerts: Fixed MimirAutoscalerNotActive to not fire if scaling metric is 0, to avoid false positives on scaled objects with 0 min replicas. #3999

Jsonnet

[CHANGE] Replaced the deprecated policy/v1beta1 with policy/v1 when configuring a PodDisruptionBudget for read-write deployment mode. #3811
[CHANGE] Removed -server.http-write-timeout default option value from querier and query-frontend, as it defaults to a higher value in the code now, and cannot be lower than -querier.timeout. #3836
[CHANGE] Replaced -store.max-query-length with -query-frontend.max-total-query-length in the query-frontend config. #3879
[CHANGE] Changed default mimir_backend_data_disk_size from 100Gi to 250Gi. #3894
[ENHANCEMENT] Update rollout-operator to v0.2.0. #3624
[ENHANCEMENT] Add user_24M and user_32M classes to operations config. #3367
[ENHANCEMENT] Update memcached image from memcached:1.6.16-alpine to memcached:1.6.17-alpine. #3914
[ENHANCEMENT] Allow configuring the ring for overrides-exporter. #3995
[BUGFIX] Apply ingesters and store-gateways per-zone CLI flags overrides to read-write deployment mode too. #3766
[BUGFIX] Apply overrides-exporter CLI flags to mimir-backend when running Mimir in read-write deployment mode. #3790
[BUGFIX] Fixed mimir-write and mimir-read Kubernetes service to correctly balance requests among pods. #3855 #3864 #3906
[BUGFIX] Fixed ruler-query-frontend and mimir-read gRPC server configuration to force clients to periodically re-resolve the backend addresses. #3862
[BUGFIX] Fixed mimir-read CLI flags to ensure query-frontend configuration takes precedence over querier configuration. #3877

Mimirtool

[ENHANCEMENT] Update mimirtool config convert to work with Mimir 2.4, 2.5, 2.6 changes. #3952
[ENHANCEMENT] Mimirtool is now available to install through Homebrew with brew install mimirtool. #3776
[ENHANCEMENT] Added --concurrency to mimirtool rules sync command. #3996
[BUGFIX] Fix summary output from mimirtool rules sync to display correct number of groups created and updated. #3918

Documentation

[BUGFIX] Querier: Remove assertion that the -querier.max-concurrent flag must also be set for the query-frontend. #3678
[ENHANCEMENT] Update migration from cortex documentation. #3662
[ENHANCEMENT] Query-scheduler: documented how to migrate from DNS-based to ring-based service discovery. #4028

Tools

2.5.0

Grafana Mimir

[CHANGE] Flag -azure.msi-resource is now ignored, and will be removed in Mimir 2.7. This setting is now made automatically by Azure. #2682
[CHANGE] Experimental flag -blocks-storage.tsdb.out-of-order-capacity-min has been removed. #3261
[CHANGE] Distributor: Wrap errors from pushing to ingesters with useful context, for example clarifying timeouts. #3307
[CHANGE] The default value of -server.http-write-timeout has changed from 30s to 2m. #3346
[CHANGE] Reduce period of health checks in connection pools for querier->store-gateway, ruler->ruler, and alertmanager->alertmanager clients to 10s. This reduces the time to fail a gRPC call when the remote stops responding. #3168
[CHANGE] Hide TSDB block ranges period config from doc and mark it experimental. #3518
[FEATURE] Alertmanager: added Discord support. #3309
[ENHANCEMENT] Added -server.tls-min-version and -server.tls-cipher-suites flags to configure cipher suites and min TLS version supported by HTTP and gRPC servers. #2898
[ENHANCEMENT] Distributor: Add age filter to forwarding functionality, to not forward samples which are older than defined duration. If such samples are not ingested, cortex_discarded_samples_total{reason="forwarded-sample-too-old"} is increased. #3049 #3113
[ENHANCEMENT] Store-gateway: Reduce memory allocation when generating ids in index cache. #3179
[ENHANCEMENT] Query-frontend: truncate queries based on the configured creation grace period (--validation.create-grace-period) to avoid querying too far into the future. #3172
[ENHANCEMENT] Ingester: Reduce activity tracker memory allocation. #3203
[ENHANCEMENT] Query-frontend: Log more detailed information in the case of a failed query. #3190
[ENHANCEMENT] Added -usage-stats.installation-mode configuration to track the installation mode via the anonymous usage statistics. #3244
[ENHANCEMENT] Compactor: Add new cortex_compactor_block_max_time_delta_seconds histogram for detecting if compaction of blocks is lagging behind. #3240 #3429
[ENHANCEMENT] Ingester: reduced the memory footprint of active series custom trackers. #2568
[ENHANCEMENT] Distributor: Include X-Scope-OrgId header in requests forwarded to configured forwarding endpoint. #3283 #3385
[ENHANCEMENT] Alertmanager: reduced memory utilization in Mimir clusters with a large number of tenants. #3309
[ENHANCEMENT] Add experimental flag -shutdown-delay to allow components to wait after receiving SIGTERM and before stopping. In this time the component returns 503 from /ready endpoint. #3298
[ENHANCEMENT] Go: update to go 1.19.3. #3371
[ENHANCEMENT] Alerts: added RulerRemoteEvaluationFailing alert, firing when communication between ruler and frontend fails in remote operational mode. #3177 #3389
[ENHANCEMENT] Clarify which S3 signature versions are supported in the error "unsupported signature version". #3376
[ENHANCEMENT] Store-gateway: improved index header reading performance. #3393 #3397 #3436
[ENHANCEMENT] Store-gateway: improved performance of series matching. #3391
[ENHANCEMENT] Move the validation of incoming series before the distributor's forwarding functionality, so that we don't forward invalid series. #3386 #3458
[ENHANCEMENT] S3 bucket configuration now validates that the endpoint does not have the bucket name prefix. #3414
[ENHANCEMENT] Query-frontend: added "fetched index bytes" to query statistics, so that the statistics contain the total bytes read by store-gateways from TSDB block indexes. #3206
[ENHANCEMENT] Distributor: push wrapper should only receive unforwarded samples. #2980
[ENHANCEMENT] Added /api/v1/status/config and /api/v1/status/flags APIs to maintain compatibility with prometheus. #3596 #3983
[BUGFIX] Flusher: Add Overrides as a dependency to prevent panics when starting with -target=flusher. #3151
[BUGFIX] Updated golang.org/x/text dependency to fix CVE-2022-32149. #3285
[BUGFIX] Query-frontend: properly close gRPC streams to the query-scheduler to stop memory and goroutines leak. #3302
[BUGFIX] Ruler: persist evaluation delay configured in the rulegroup. #3392
[BUGFIX] Ring status pages: show 100% ownership as "100%", not "1e+02%". #3435
[BUGFIX] Fix panics in OTLP ingest path when parse errors exist. #3538

Mixin

[CHANGE] Alerts: Change MimirSchedulerQueriesStuck for time to 7 minutes to account for the time it takes for HPA to scale up. #3223
[CHANGE] Dashboards: Removed the Querier > Stages panel from the Mimir / Queries dashboard. #3311
[CHANGE] Configuration: The format of the autoscaling section of the configuration has changed to support more components. #3378
- Instead of specific config variables for each component, they are listed in a dictionary. For example, autoscaling.querier_enabled becomes autoscaling.querier.enabled.
[FEATURE] Dashboards: Added "Mimir / Overview resources" dashboard, providing an high level view over a Mimir cluster resources utilization. #3481
[FEATURE] Dashboards: Added "Mimir / Overview networking" dashboard, providing an high level view over a Mimir cluster network bandwidth, inflight requests and TCP connections. #3487
[FEATURE] Compile baremetal mixin along k8s mixin. #3162 #3514
[ENHANCEMENT] Alerts: Add MimirRingMembersMismatch firing when a component does not have the expected number of running jobs. #2404
[ENHANCEMENT] Dashboards: Add optional row about the Distributor's metric forwarding feature to the Mimir / Writes dashboard. #3182 #3394 #3394 #3461
[ENHANCEMENT] Dashboards: Remove the "Instance Mapper" row from the "Alertmanager Resources Dashboard". This is a Grafana Cloud specific service and not relevant for external users. #3152
[ENHANCEMENT] Dashboards: Add "remote read", "metadata", and "exemplar" queries to "Mimir / Overview" dashboard. #3245
[ENHANCEMENT] Dashboards: Use non-red colors for non-error series in the "Mimir / Overview" dashboard. #3246
[ENHANCEMENT] Dashboards: Add support to multi-zone deployments for the experimental read-write deployment mode. #3256
[ENHANCEMENT] Dashboards: If enabled, add new row to the Mimir / Writes for distributor autoscaling metrics. #3378
[ENHANCEMENT] Dashboards: Add read path insights row to the "Mimir / Tenants" dashboard. #3326
[ENHANCEMENT] Alerts: Add runbook urls for alerts. #3452
[ENHANCEMENT] Configuration: Make it possible to configure namespace label, job label, and job prefix. #3482
[ENHANCEMENT] Dashboards: improved resources and networking dashboards to work with read-write deployment mode too. #3497 #3504 #3519 #3531
[ENHANCEMENT] Alerts: Added "MimirDistributorForwardingErrorRate" alert, which fires on high error rates in the distributor’s forwarding feature. #3200
[ENHANCEMENT] Improve phrasing in Overview dashboard. #3488
[BUGFIX] Dashboards: Fix legend showing persistentvolumeclaim when using deployment_type=baremetal for Disk space utilization panels. #3173 #3184
[BUGFIX] Alerts: Fixed MimirGossipMembersMismatch alert when Mimir is deployed in read-write mode. #3489
[BUGFIX] Dashboards: Remove "Inflight requests" from object store panels because the panel is not tracking the inflight requests to object storage. #3521

Jsonnet

[CHANGE] Replaced the deprecated policy/v1beta1 with policy/v1 when configuring a PodDisruptionBudget. #3284
[CHANGE] Common storage configuration is now used to configure object storage in all components. This is a breaking change in terms of Jsonnet manifests and also a CLI flag update for components that use object storage, so it will require a rollout of those components. The changes include: #3257
- blocks_storage_backend was renamed to storage_backend and is now used as the common storage backend for all components.
  - So were the related blocks_storage_azure_account_(name|key) and blocks_storage_s3_endpoint configurations.
- storage_s3_endpoint is now rendered by default using the aws_region configuration instead of a hardcoded us-east-1.
- ruler_client_type and alertmanager_client_type were renamed to ruler_storage_backend and alertmanager_storage_backend respectively, and their corresponding CLI flags won't be rendered unless explicitly set to a value different from the one in storage_backend (like local).
- alertmanager_s3_bucket_name, alertmanager_gcs_bucket_name and alertmanager_azure_container_name have been removed, and replaced by a single alertmanager_storage_bucket_name configuration used for all object storages.
- genericBlocksStorageConfig configuration object was removed, and so any extensions to it will be now ignored. Use blockStorageConfig instead.
- rulerClientConfig and alertmanagerStorageClientConfig configuration objects were renamed to rulerStorageConfig and alertmanagerStorageConfig respectively, and so any extensions to their previous names will be now ignored. Use the new names instead.
- The CLI flags *.s3.region are no longer rendered as they are optional and the region can be inferred by Mimir by performing an initial API call to the endpoint.
- The migration to this change should usually consist of:
  - Renaming blocks_storage_backend key to storage_backend.
  - For Azure/S3:
    - Renaming blocks_storage_(azure|s3)_* configurations to storage_(azure|s3)_*.
    - If ruler_storage_(azure|s3)_* and alertmanager_storage_(azure|s3)_* keys were different from the block_storage_* ones, they should be now provided using CLI flags, see configuration reference for more details.
  - Removing ruler_client_type and alertmanager_client_type if their value match the storage_backend, or renaming them to their new names otherwise.
  - Reviewing any possible extensions to genericBlocksStorageConfig, rulerClientConfig and alertmanagerStorageClientConfig and moving them to the corresponding new options.
  - Renaming the alertmanager's bucket name configuration from provider-specific to the new alertmanager_storage_bucket_name key.
[CHANGE] The overrides-exporter.libsonnet file is now always imported. The overrides-exporter can be enabled in jsonnet setting the following: #3379
```
{
  _config+:: {
    overrides_exporter_enabled: true,
  }
}
```
[FEATURE] Added support for experimental read-write deployment mode. Enabling the read-write deployment mode on a existing Mimir cluster is a destructive operation, because the cluster will be re-created. If you're creating a new Mimir cluster, you can deploy it in read-write mode adding the following configuration: #3379 #3475 #3405
```
{
  _config+:: {
    deployment_mode: 'read-write',

    // See operations/mimir/read-write-deployment.libsonnet for more configuration options.
    mimir_write_replicas: 3,
    mimir_read_replicas: 2,
    mimir_backend_replicas: 3,
  }
}
```
[ENHANCEMENT] Add autoscaling support to the mimir-read component when running the read-write-deployment model. #3419
[ENHANCEMENT] Added $._config.usageStatsConfig to track the installation mode via the anonymous usage statistics. #3294
[ENHANCEMENT] The query-tee node port ($._config.query_tee_node_port) is now optional. #3272
[ENHANCEMENT] Add support for autoscaling distributors. #3378
[ENHANCEMENT] Make auto-scaling logic ensure integer KEDA thresholds. #3512
[BUGFIX] Fixed query-scheduler ring configuration for dedicated ruler's queries and query-frontends. #3237 #3239
[BUGFIX] Jsonnet: Fix auto-scaling so that ruler-querier CPU threshold is a string-encoded integer millicores value. #3520

Mimirtool

[FEATURE] Added mimirtool alertmanager verify command to validate configuration without uploading. #3440
[ENHANCEMENT] Added mimirtool rules delete-namespace command to delete all of the rule groups in a namespace including the namespace itself. #3136
[ENHANCEMENT] Refactor mimirtool analyze prometheus: add concurrency and resiliency #3349
- Add --concurrency flag. Default: number of logical CPUs
[BUGFIX] --log.level=debug now correctly prints the response from the remote endpoint when a request fails. #3180

Documentation

[ENHANCEMENT] Documented how to configure HA deduplication using Consul in a Mimir Helm deployment. #2972
[ENHANCEMENT] Improve MimirQuerierAutoscalerNotActive runbook. #3186
[ENHANCEMENT] Improve MimirSchedulerQueriesStuck runbook to reflect debug steps with querier auto-scaling enabled. #3223
[ENHANCEMENT] Use imperative for docs titles. #3178 #3332 #3343
[ENHANCEMENT] Docs: mention gRPC compression in "Production tips". #3201
[ENHANCEMENT] Update ADOPTERS.md. #3224 #3225
[ENHANCEMENT] Add a note for jsonnet deploying. #3213
[ENHANCEMENT] out-of-order runbook update with use case. #3253
[ENHANCEMENT] Fixed TSDB retention mentioned in the "Recover source blocks from ingesters" runbook. #3280
[ENHANCEMENT] Run Grafana Mimir in production using the Helm chart. #3072
[ENHANCEMENT] Use common configuration in the tutorial. #3282
[ENHANCEMENT] Updated detailed steps for migrating blocks from Thanos to Mimir. #3290
[ENHANCEMENT] Add scheme to DNS service discovery docs. #3450
[BUGFIX] Remove reference to file that no longer exists in contributing guide. #3404
[BUGFIX] Fix some minor typos in the contributing guide and on the runbooks page. #3418
[BUGFIX] Fix small typos in API reference. #3526
[BUGFIX] Fixed TSDB retention mentioned in the "Recover source blocks from ingesters" runbook. #3278
[BUGFIX] Fixed configuration example in the "Configuring the Grafana Mimir query-frontend to work with Prometheus" guide. #3374

Tools

[FEATURE] Add copyblocks tool, to copy Mimir blocks between two GCS buckets. #3264
[ENHANCEMENT] copyblocks: copy no-compact global markers and optimize min time filter check. #3268
[ENHANCEMENT] Mimir rules GitHub action: Added the ability to change default value of label when running prepare command. #3236
[BUGFIX] Mimir rules Github action: Fix single line output. #3421

2.4.0

Grafana Mimir

[CHANGE] Distributor: change the default value of -distributor.remote-timeout to 2s from 20s and -distributor.forwarding.request-timeout to 2s from 10s to improve distributor resource usage when ingesters crash. #2728 #2912
[CHANGE] Anonymous usage statistics tracking: added the -ingester.ring.store value. #2981
[CHANGE] Series metadata HELP that is longer than -validation.max-metadata-length is now truncated silently, instead of being dropped with a 400 status code. #2993
[CHANGE] Ingester: changed default setting for -ingester.ring.readiness-check-ring-health from true to false. #2953
[CHANGE] Anonymous usage statistics tracking has been enabled by default, to help Mimir maintainers make better decisions to support the open source community. #2939 #3034
[CHANGE] Anonymous usage statistics tracking: added the minimum and maximum value of -ingester.out-of-order-time-window. #2940
[CHANGE] The default hash ring heartbeat period for distributors, ingesters, rulers and compactors has been increased from 5s to 15s. Now the default heartbeat period for all Mimir hash rings is 15s. #3033
[CHANGE] Reduce the default TSDB head compaction concurrency (-blocks-storage.tsdb.head-compaction-concurrency) from 5 to 1, in order to reduce CPU spikes. #3093
[CHANGE] Ruler: the ruler's remote evaluation mode (-ruler.query-frontend.address) is now stable. #3109
[CHANGE] Limits: removed the deprecated YAML configuration option active_series_custom_trackers_config. Please use active_series_custom_trackers instead. #3110
[CHANGE] Ingester: removed the deprecated configuration option -ingester.ring.join-after. #3111
[CHANGE] Querier: removed the deprecated configuration option -querier.shuffle-sharding-ingesters-lookback-period. The value of -querier.query-ingesters-within is now used internally for shuffle sharding lookback, while you can use -querier.shuffle-sharding-ingesters-enabled to enable or disable shuffle sharding on the read path. #3111
[CHANGE] Memberlist: cluster label verification feature (-memberlist.cluster-label and -memberlist.cluster-label-verification-disabled) is now marked as stable. #3108
[CHANGE] Distributor: only single per-tenant forwarding endpoint can be configured now. Support for per-rule endpoint has been removed. #3095
[FEATURE] Query-scheduler: added an experimental ring-based service discovery support for the query-scheduler. Refer to query-scheduler configuration for more information. #2957
[FEATURE] Introduced the experimental endpoint /api/v1/user_limits exposed by all components that load runtime configuration. This endpoint exposes realtime limits for the authenticated tenant, in JSON format. #2864 #3017
[FEATURE] Query-scheduler: added the experimental configuration option -query-scheduler.max-used-instances to restrict the number of query-schedulers effectively used regardless how many replicas are running. This feature can be useful when using the experimental read-write deployment mode. #3005
[ENHANCEMENT] Go: updated to go 1.19.2. #2637 #3127 #3129
[ENHANCEMENT] Runtime config: don't unmarshal runtime configuration files if they haven't changed. This can save a bit of CPU and memory on every component using runtime config. #2954
[ENHANCEMENT] Query-frontend: Add cortex_frontend_query_result_cache_skipped_total and cortex_frontend_query_result_cache_attempted_total metrics to track the reason why query results are not cached. #2855
[ENHANCEMENT] Distributor: pool more connections per host when forwarding request. Mark requests as idempotent so they can be retried under some conditions. #2968
[ENHANCEMENT] Distributor: failure to send request to forwarding target now also increments cortex_distributor_forward_errors_total, with status_code="failed". #2968
[ENHANCEMENT] Distributor: added support forwarding push requests via gRPC, using httpgrpc messages from weaveworks/common library. #2996
[ENHANCEMENT] Query-frontend / Querier: increase internal backoff period used to retry connections to query-frontend / query-scheduler. #3011
[ENHANCEMENT] Querier: do not log "error processing requests from scheduler" when the query-scheduler is shutting down. #3012
[ENHANCEMENT] Query-frontend: query sharding process is now time-bounded and it is cancelled if the request is aborted. #3028
[ENHANCEMENT] Query-frontend: improved Prometheus response JSON encoding performance. #2450
[ENHANCEMENT] TLS: added configuration parameters to configure the client's TLS cipher suites and minimum version. The following new CLI flags have been added: #3070
- -alertmanager.alertmanager-client.tls-cipher-suites
- -alertmanager.alertmanager-client.tls-min-version
- -alertmanager.sharding-ring.etcd.tls-cipher-suites
- -alertmanager.sharding-ring.etcd.tls-min-version
- -compactor.ring.etcd.tls-cipher-suites
- -compactor.ring.etcd.tls-min-version
- -distributor.forwarding.grpc-client.tls-cipher-suites
- -distributor.forwarding.grpc-client.tls-min-version
- -distributor.ha-tracker.etcd.tls-cipher-suites
- -distributor.ha-tracker.etcd.tls-min-version
- -distributor.ring.etcd.tls-cipher-suites
- -distributor.ring.etcd.tls-min-version
- -ingester.client.tls-cipher-suites
- -ingester.client.tls-min-version
- -ingester.ring.etcd.tls-cipher-suites
- -ingester.ring.etcd.tls-min-version
- -memberlist.tls-cipher-suites
- -memberlist.tls-min-version
- -querier.frontend-client.tls-cipher-suites
- -querier.frontend-client.tls-min-version
- -querier.store-gateway-client.tls-cipher-suites
- -querier.store-gateway-client.tls-min-version
- -query-frontend.grpc-client-config.tls-cipher-suites
- -query-frontend.grpc-client-config.tls-min-version
- -query-scheduler.grpc-client-config.tls-cipher-suites
- -query-scheduler.grpc-client-config.tls-min-version
- -query-scheduler.ring.etcd.tls-cipher-suites
- -query-scheduler.ring.etcd.tls-min-version
- -ruler.alertmanager-client.tls-cipher-suites
- -ruler.alertmanager-client.tls-min-version
- -ruler.client.tls-cipher-suites
- -ruler.client.tls-min-version
- -ruler.query-frontend.grpc-client-config.tls-cipher-suites
- -ruler.query-frontend.grpc-client-config.tls-min-version
- -ruler.ring.etcd.tls-cipher-suites
- -ruler.ring.etcd.tls-min-version
- -store-gateway.sharding-ring.etcd.tls-cipher-suites
- -store-gateway.sharding-ring.etcd.tls-min-version
[ENHANCEMENT] Store-gateway: Add -blocks-storage.bucket-store.max-concurrent-reject-over-limit option to allow requests that exceed the max number of inflight object storage requests to be rejected. #2999
[ENHANCEMENT] Query-frontend: allow setting a separate limit on the total (before splitting/sharding) query length of range queries with the new experimental -query-frontend.max-total-query-length flag, which defaults to -store.max-query-length if unset or set to 0. #3058
[ENHANCEMENT] Query-frontend: Lower TTL for cache entries overlapping the out-of-order samples ingestion window (re-using -ingester.out-of-order-allowance from ingesters). #2935
[ENHANCEMENT] Ruler: added support to forcefully disable recording and/or alerting rules evaluation. The following new configuration options have been introduced, which can be overridden on a per-tenant basis in the runtime configuration: #3088
- -ruler.recording-rules-evaluation-enabled
- -ruler.alerting-rules-evaluation-enabled
[ENHANCEMENT] Distributor: Improved error messages reported when the distributor fails to remote write to ingesters. #3055
[ENHANCEMENT] Improved tracing spans tracked by distributors, ingesters and store-gateways. #2879 #3099 #3089
[ENHANCEMENT] Ingester: improved the performance of label value cardinality endpoint. #3044
[ENHANCEMENT] Ruler: use backoff retry on remote evaluation #3098
[ENHANCEMENT] Query-frontend: Include multiple tenant IDs in query logs when present instead of dropping them. #3125
[ENHANCEMENT] Query-frontend: truncate queries based on the configured blocks retention period (-compactor.blocks-retention-period) to avoid querying past this period. #3134
[ENHANCEMENT] Alertmanager: reduced memory utilization in Mimir clusters with a large number of tenants. #3143
[ENHANCEMENT] Store-gateway: added extra span logging to improve observability. #3131
[ENHANCEMENT] Compactor: cleaning up different tenants' old blocks and updating bucket indexes is now more independent. This prevents a single tenant from delaying cleanup for other tenants. #2631
[ENHANCEMENT] Distributor: request rate, ingestion rate, and inflight requests limits are now enforced before reading and parsing the body of the request. This makes the distributor more resilient against a burst of requests over those limit. #2419
[BUGFIX] Querier: Fix 400 response while handling streaming remote read. #2963
[BUGFIX] Fix a bug causing query-frontend, query-scheduler, and querier not failing if one of their internal components fail. #2978
[BUGFIX] Querier: re-balance the querier worker connections when a query-frontend or query-scheduler is terminated. #3005
[BUGFIX] Distributor: Now returns the quorum error from ingesters. For example, with replication_factor=3, two HTTP 400 errors and one HTTP 500 error, now the distributor will always return HTTP 400. Previously the behaviour was to return the error which the distributor first received. #2979
[BUGFIX] Ruler: fix panic when ruler.external_url is explicitly set to an empty string ("") in YAML. #2915
[BUGFIX] Alertmanager: Fix support for the Telegram API URL in the global settings. #3097
[BUGFIX] Alertmanager: Fix parsing of label matchers without label value in the API used to retrieve alerts. #3097
[BUGFIX] Ruler: Fix not restoring alert state for rule groups when other ruler replicas shut down. #3156
[BUGFIX] Updated golang.org/x/net dependency to fix CVE-2022-27664. #3124
[BUGFIX] Fix distributor from returning a 500 status code when a 400 was received from the ingester. #3211
[BUGFIX] Fix incorrect OS value set in Mimir v2.3.* RPM packages. #3221

Mixin

[CHANGE] Alerts: MimirQuerierAutoscalerNotActive is now critical and fires after 1h instead of 15m. #2958
[FEATURE] Dashboards: Added "Mimir / Overview" dashboards, providing an high level view over a Mimir cluster. #3122 #3147 #3155
[ENHANCEMENT] Dashboards: Updated the "Writes" and "Rollout progress" dashboards to account for samples ingested via the new OTLP ingestion endpoint. #2919 #2938
[ENHANCEMENT] Dashboards: Include per-tenant request rate in "Tenants" dashboard. #2874
[ENHANCEMENT] Dashboards: Include inflight object store requests in "Reads" dashboard. #2914
[ENHANCEMENT] Dashboards: Make queries used to find job, cluster and namespace for dropdown menus configurable. #2893
[ENHANCEMENT] Dashboards: Include rate of label and series queries in "Reads" dashboard. #3065 #3074
[ENHANCEMENT] Dashboards: Fix legend showing on per-pod panels. #2944
[ENHANCEMENT] Dashboards: Use the "req/s" unit on panels showing the requests rate. #3118
[ENHANCEMENT] Dashboards: Use a consistent color across dashboards for the error rate. #3154

Jsonnet

[FEATURE] Added support for query-scheduler ring-based service discovery. #3128
[ENHANCEMENT] Querier autoscaling is now slower on scale downs: scale down 10% every 1m instead of 100%. #2962
[BUGFIX] Memberlist: gossip_member_label is now set for ruler-queriers. #3141

Mimirtool

[ENHANCEMENT] mimirtool analyze: Store the query errors instead of exit during the analysis. #3052
[BUGFIX] mimir-tool remote-read: fix returns where some conditions return nil error even if there is error. #3053

Documentation

[ENHANCEMENT] Added documentation on how to configure storage retention. #2970
[ENHANCEMENT] Improved gRPC clients config documentation. #3020
[ENHANCEMENT] Added documentation on how to manage alerting and recording rules. #2983
[ENHANCEMENT] Improved MimirSchedulerQueriesStuck runbook. #3006
[ENHANCEMENT] Added "Cluster label verification" section to memberlist documentation. #3096
[ENHANCEMENT] Mention compression in multi-zone replication documentation. #3107
[BUGFIX] Fixed configuration option names in "Enabling zone-awareness via the Grafana Mimir Jsonnet". #3018
[BUGFIX] Fixed mimirtool analyze parameters documentation. #3094
[BUGFIX] Fixed YAML configuraton in the "Manage the configuration of Grafana Mimir with Helm" guide. #3042
[BUGFIX] Fixed Alertmanager capacity planning documentation. #3132

Tools

[BUGFIX] trafficdump: Fixed panic occurring when -success-only=true and the captured request failed. #2863

2.3.1

Grafana Mimir

[BUGFIX] Query-frontend: query sharding took exponential time to map binary expressions. #3027
[BUGFIX] Distributor: Stop panics on OTLP endpoint when a single metric has multiple timeseries. #3040

2.3.0

Grafana Mimir

[CHANGE] Ingester: Added user label to ingester metric cortex_ingester_tsdb_out_of_order_samples_appended_total. On multitenant clusters this helps us find the rate of appended out-of-order samples for a specific tenant. #2493
[CHANGE] Compactor: delete source and output blocks from local disk on compaction failed, to reduce likelihood that subsequent compactions fail because of no space left on disk. #2261
[CHANGE] Ruler: Remove unused CLI flags -ruler.search-pending-for and -ruler.flush-period (and their respective YAML config options). #2288
[CHANGE] Successful gRPC requests are no longer logged (only affects internal API calls). #2309
[CHANGE] Add new -*.consul.cas-retry-delay flags. They have a default value of 1s, while previously there was no delay between retries. #2309
[CHANGE] Store-gateway: Remove the experimental ability to run requests in a dedicated OS thread pool and associated CLI flag -store-gateway.thread-pool-size. #2423
[CHANGE] Memberlist: disabled TCP-based ping fallback, because Mimir already uses a custom transport based on TCP. #2456
[CHANGE] Change default value for -distributor.ha-tracker.max-clusters to 100 to provide a DoS protection. #2465
[CHANGE] Experimental block upload API exposed by compactor has changed: Previous /api/v1/upload/block/{block} endpoint for starting block upload is now /api/v1/upload/block/{block}/start, and previous endpoint /api/v1/upload/block/{block}?uploadComplete=true for finishing block upload is now /api/v1/upload/block/{block}/finish. New API endpoint has been added: /api/v1/upload/block/{block}/check. #2486 #2548
[CHANGE] Compactor: changed -compactor.max-compaction-time default from 0s (disabled) to 1h. When compacting blocks for a tenant, the compactor will move to compact blocks of another tenant or re-plan blocks to compact at least every 1h. #2514
[CHANGE] Distributor: removed previously deprecated extend_writes (see #1856) YAML key and -distributor.extend-writes CLI flag from the distributor config. #2551
[CHANGE] Ingester: removed previously deprecated active_series_custom_trackers (see #1188) YAML key from the ingester config. #2552
[CHANGE] The tenant ID __mimir_cluster is reserved by Mimir and not allowed to store metrics. #2643
[CHANGE] Purger: removed the purger component and moved its API endpoints /purger/delete_tenant and /purger/delete_tenant_status to the compactor at /compactor/delete_tenant and /compactor/delete_tenant_status. The new endpoints on the compactor are stable. #2644
[CHANGE] Memberlist: Change the leave timeout duration (-memberlist.leave-timeout duration) from 5s to 20s and connection timeout (-memberlist.packet-dial-timeout) from 5s to 2s. This makes leave timeout 10x the connection timeout, so that we can communicate the leave to at least 1 node, if the first 9 we try to contact times out. #2669
[CHANGE] Alertmanager: return status code 412 Precondition Failed and log info message when alertmanager isn't configured for a tenant. #2635
[CHANGE] Distributor: if forwarding rules are used to forward samples, exemplars are now removed from the request. #2710 #2725
[CHANGE] Limits: change the default value of max_global_series_per_metric limit to 0 (disabled). Setting this limit by default does not provide much benefit because series are sharded by all labels. #2714
[CHANGE] Ingester: experimental -blocks-storage.tsdb.new-chunk-disk-mapper has been removed, new chunk disk mapper is now always used, and is no longer marked experimental. Default value of -blocks-storage.tsdb.head-chunks-write-queue-size has changed to 1000000, this enables async chunk queue by default, which leads to improved latency on the write path when new chunks are created in ingesters. #2762
[CHANGE] Ingester: removed deprecated -blocks-storage.tsdb.isolation-enabled option. TSDB-level isolation is now always disabled in Mimir. #2782
[CHANGE] Compactor: -compactor.partial-block-deletion-delay must either be set to 0 (to disable partial blocks deletion) or a value higher than 4h. #2787
[CHANGE] Query-frontend: CLI flag -query-frontend.align-querier-with-step has been deprecated. Please use -query-frontend.align-queries-with-step instead. #2840
[FEATURE] Compactor: Adds the ability to delete partial blocks after a configurable delay. This option can be configured per tenant. #2285
- -compactor.partial-block-deletion-delay, as a duration string, allows you to set the delay since a partial block has been modified before marking it for deletion. A value of 0, the default, disables this feature.
- The metric cortex_compactor_blocks_marked_for_deletion_total has a new value for the reason label reason="partial", when a block deletion marker is triggered by the partial block deletion delay.
[FEATURE] Querier: enabled support for queries with negative offsets, which are not cached in the query results cache. #2429
[FEATURE] EXPERIMENTAL: OpenTelemetry Metrics ingestion path on /otlp/v1/metrics. #695 #2436 #2461
[FEATURE] Querier: Added support for tenant federation to metric metadata endpoint. #2467
[FEATURE] Query-frontend: introduced experimental support to split instant queries by time. The instant query splitting can be enabled setting -query-frontend.split-instant-queries-by-interval. #2469 #2564 #2565 #2570 #2571 #2572 #2573 #2574 #2575 #2576 #2581 #2582 #2601 #2632 #2633 #2634 #2641 #2642 #2766
[FEATURE] Introduced an experimental anonymous usage statistics tracking (disabled by default), to help Mimir maintainers make better decisions to support the open source community. The tracking system anonymously collects non-sensitive, non-personally identifiable information about the running Mimir cluster, and is disabled by default. #2643 #2662 #2685 #2732 #2733 #2735
[FEATURE] Introduced an experimental deployment mode called read-write and running a fully featured Mimir cluster with three components: write, read and backend. The read-write deployment mode is a trade-off between the monolithic mode (only one component, no isolation) and the microservices mode (many components, high isolation). #2754 #2838
[ENHANCEMENT] Distributor: Decreased distributor tests execution time. #2562
[ENHANCEMENT] Alertmanager: Allow the HTTP proxy_url configuration option in the receiver's configuration. #2317
[ENHANCEMENT] ring: optimize shuffle-shard computation when lookback is used, and all instances have registered timestamp within the lookback window. In that case we can immediately return origial ring, because we would select all instances anyway. #2309
[ENHANCEMENT] Memberlist: added experimental memberlist cluster label support via -memberlist.cluster-label and -memberlist.cluster-label-verification-disabled CLI flags (and their respective YAML config options). #2354
[ENHANCEMENT] Object storage can now be configured for all components using the common YAML config option key (or -common.storage.* CLI flags). #2330 #2347
[ENHANCEMENT] Go: updated to go 1.18.4. #2400
[ENHANCEMENT] Store-gateway, listblocks: list of blocks now includes stats from meta.json file: number of series, samples and chunks. #2425
[ENHANCEMENT] Added more buckets to cortex_ingester_client_request_duration_seconds histogram metric, to correctly track requests taking longer than 1s (up until 16s). #2445
[ENHANCEMENT] Azure client: Improve memory usage for large object storage downloads. #2408
[ENHANCEMENT] Distributor: Add -distributor.instance-limits.max-inflight-push-requests-bytes. This limit protects the distributor against multiple large requests that together may cause an OOM, but are only a few, so do not trigger the max-inflight-push-requests limit. #2413
[ENHANCEMENT] Distributor: Drop exemplars in distributor for tenants where exemplars are disabled. #2504
[ENHANCEMENT] Runtime Config: Allow operator to specify multiple comma-separated yaml files in -runtime-config.file that will be merged in left to right order. #2583
[ENHANCEMENT] Query sharding: shard binary operations only if it doesn't lead to non-shardable vector selectors in one of the operands. #2696
[ENHANCEMENT] Add packaging for both debian based deb file and redhat based rpm file using FPM. #1803
[ENHANCEMENT] Distributor: Add cortex_distributor_query_ingester_chunks_deduped_total and cortex_distributor_query_ingester_chunks_total metrics for determining how effective ingester chunk deduplication at query time is. #2713
[ENHANCEMENT] Upgrade Docker base images to alpine:3.16.2. #2729
[ENHANCEMENT] Ruler: Add <prometheus-http-prefix>/api/v1/status/buildinfo endpoint. #2724
[ENHANCEMENT] Querier: Ensure all queries pulled from query-frontend or query-scheduler are immediately executed. The maximum workers concurrency in each querier is configured by -querier.max-concurrent. #2598
[ENHANCEMENT] Distributor: Add cortex_distributor_received_requests_total and cortex_distributor_requests_in_total metrics to provide visiblity into appropriate per-tenant request limits. #2770
[ENHANCEMENT] Distributor: Add single forwarding remote-write endpoint for a tenant (forwarding_endpoint), instead of using per-rule endpoints. This takes precendence over per-rule endpoints. #2801
[ENHANCEMENT] Added err-mimir-distributor-max-write-message-size to the errors catalog. #2470
[ENHANCEMENT] Add sanity check at startup to ensure the configured filesystem directories don't overlap for different components. #2828 #2947
[BUGFIX] TSDB: Fixed a bug on the experimental out-of-order implementation that led to wrong query results. #2701
[BUGFIX] Compactor: log the actual error on compaction failed. #2261
[BUGFIX] Alertmanager: restore state from storage even when running a single replica. #2293
[BUGFIX] Ruler: do not block "List Prometheus rules" API endpoint while syncing rules. #2289
[BUGFIX] Ruler: return proper *status.Status error when running in remote operational mode. #2417
[BUGFIX] Alertmanager: ensure the configured -alertmanager.web.external-url is either a path starting with /, or a full URL including the scheme and hostname. #2381 #2542
[BUGFIX] Memberlist: fix problem with loss of some packets, typically ring updates when instances were removed from the ring during shutdown. #2418
[BUGFIX] Ingester: fix misfiring MimirIngesterHasUnshippedBlocks and stale cortex_ingester_oldest_unshipped_block_timestamp_seconds when some block uploads fail. #2435
[BUGFIX] Query-frontend: fix incorrect mapping of http status codes 429 to 500 when request queue is full. #2447
[BUGFIX] Memberlist: Fix problem with ring being empty right after startup. Memberlist KV store now tries to "fast-join" the cluster to avoid serving empty KV store. #2505
[BUGFIX] Compactor: Fix bug when using -compactor.partial-block-deletion-delay: compactor didn't correctly check for modification time of all block files. #2559
[BUGFIX] Query-frontend: fix wrong query sharding results for queries with boolean result like 1 < bool 0. #2558
[BUGFIX] Fixed error messages related to per-instance limits incorrectly reporting they can be set on a per-tenant basis. #2610
[BUGFIX] Perform HA-deduplication before forwarding samples according to forwarding rules in the distributor. #2603 #2709
[BUGFIX] Fix reporting of tracing spans from PromQL engine. #2707
[BUGFIX] Apply relabel and drop_label rules before forwarding rules in the distributor. #2703
[BUGFIX] Distributor: Register cortex_discarded_requests_total metric, which previously was not registered and therefore not exported. #2712
[BUGFIX] Ruler: fix not restoring alerts' state at startup. #2648
[BUGFIX] Ingester: Fix disk filling up after restarting ingesters with out-of-order support disabled while it was enabled before. #2799
[BUGFIX] Memberlist: retry joining memberlist cluster on startup when no nodes are resolved. #2837
[BUGFIX] Query-frontend: fix incorrect mapping of http status codes 413 to 500 when request is too large. #2819
[BUGFIX] Alertmanager: revert upstream alertmananger to v0.24.0 to fix panic when unmarshalling email headers #2924 #2925

Mixin

[CHANGE] Dashboards: "Slow Queries" dashboard no longer works with versions older than Grafana 9.0. #2223
[CHANGE] Alerts: use RSS memory instead of working set memory in the MimirAllocatingTooMuchMemory alert for ingesters. #2480
[CHANGE] Dashboards: remove the "Cache - Latency (old)" panel from the "Mimir / Queries" dashboard. #2796
[FEATURE] Dashboards: added support to experimental read-write deployment mode. #2780
[ENHANCEMENT] Dashboards: added missed rule evaluations to the "Evaluations per second" panel in the "Mimir / Ruler" dashboard. #2314
[ENHANCEMENT] Dashboards: add k8s resource requests to CPU and memory panels. #2346
[ENHANCEMENT] Dashboards: add RSS memory utilization panel for ingesters, store-gateways and compactors. #2479
[ENHANCEMENT] Dashboards: allow to configure graph tooltip. #2647
[ENHANCEMENT] Alerts: MimirFrontendQueriesStuck and MimirSchedulerQueriesStuck alerts are more reliable now as they consider all the intermediate samples in the minute prior to the evaluation. #2630
[ENHANCEMENT] Alerts: added RolloutOperatorNotReconciling alert, firing if the optional rollout-operator is not successfully reconciling. #2700
[ENHANCEMENT] Dashboards: added support to query-tee in front of ruler-query-frontend in the "Remote ruler reads" dashboard. #2761
[ENHANCEMENT] Dashboards: Introduce support for baremetal deployment, setting deployment_type: 'baremetal' in the mixin _config. #2657
[ENHANCEMENT] Dashboards: use timeseries panel to show exemplars. #2800
[BUGFIX] Dashboards: fixed unit of latency panels in the "Mimir / Ruler" dashboard. #2312
[BUGFIX] Dashboards: fixed "Intervals per query" panel in the "Mimir / Queries" dashboard. #2308
[BUGFIX] Dashboards: Make "Slow Queries" dashboard works with Grafana 9.0. #2223
[BUGFIX] Dashboards: add missing API routes to Ruler dashboard. #2412
[BUGFIX] Dashboards: stop setting 'interval' in dashboards; it should be set on your datasource. #2802

Jsonnet

[CHANGE] query-scheduler is enabled by default. We advise to deploy the query-scheduler to improve the scalability of the query-frontend. #2431
[CHANGE] Replaced anti-affinity rules with pod topology spread constraints for distributor, query-frontend, querier and ruler. #2517
- The following configuration options have been removed:
  - distributor_allow_multiple_replicas_on_same_node
  - query_frontend_allow_multiple_replicas_on_same_node
  - querier_allow_multiple_replicas_on_same_node
  - ruler_allow_multiple_replicas_on_same_node
- The following configuration options have been added:
  - distributor_topology_spread_max_skew
  - query_frontend_topology_spread_max_skew
  - querier_topology_spread_max_skew
  - ruler_topology_spread_max_skew
[CHANGE] Change max_global_series_per_metric to 0 in all plans, and as a default value. #2669
[FEATURE] Memberlist: added support for experimental memberlist cluster label, through the jsonnet configuration options memberlist_cluster_label and memberlist_cluster_label_verification_disabled. #2349
[FEATURE] Added ruler-querier autoscaling support. It requires KEDA installed in the Kubernetes cluster. Ruler-querier autoscaler can be enabled and configure through the following options in the jsonnet config: #2545
- autoscaling_ruler_querier_enabled: true to enable autoscaling.
- autoscaling_ruler_querier_min_replicas: minimum number of ruler-querier replicas.
- autoscaling_ruler_querier_max_replicas: maximum number of ruler-querier replicas.
- autoscaling_prometheus_url: Prometheus base URL from which to scrape Mimir metrics (e.g. http://prometheus.default:9090/prometheus).
[ENHANCEMENT] Memberlist now uses DNS service-discovery by default. #2549
[ENHANCEMENT] Upgrade memcached image tag to memcached:1.6.16-alpine. #2740
[ENHANCEMENT] Added $._config.configmaps and $._config.runtime_config_files to make it easy to add new configmaps or runtime config file to all components. #2748

Mimirtool

[ENHANCEMENT] Added mimirtool backfill command to upload Prometheus blocks using API available in the compactor. #1822
[ENHANCEMENT] mimirtool bucket-validation: Verify existing objects can be overwritten by subsequent uploads. #2491
[ENHANCEMENT] mimirtool config convert: Now supports migrating to the current version of Mimir. #2629
[BUGFIX] mimirtool analyze: Fix dashboard JSON unmarshalling errors by using custom parsing. #2386
[BUGFIX] Version checking no longer prompts for updating when already on latest version. #2723

Mimir Continuous Test

[ENHANCEMENT] Added basic authentication and bearer token support for when Mimir is behind a gateway authenticating the calls. #2717

Query-tee

[CHANGE] Renamed CLI flag -server.service-port to -server.http-service-port. #2683
[CHANGE] Renamed metric cortex_querytee_request_duration_seconds to cortex_querytee_backend_request_duration_seconds. Metric cortex_querytee_request_duration_seconds is now reported without label backend. #2683
[ENHANCEMENT] Added HTTP over gRPC support to query-tee to allow testing gRPC requests to Mimir instances. #2683

Documentation

[ENHANCEMENT] Referenced mimirtool commands in the HTTP API documentation. #2516
[ENHANCEMENT] Improved DNS service discovery documentation. #2513

Tools

[ENHANCEMENT] markblocks now processes multiple blocks concurrently. #2677

2.2.0

Grafana Mimir

[CHANGE] Increased default configuration for -server.grpc-max-recv-msg-size-bytes and -server.grpc-max-send-msg-size-bytes from 4MB to 100MB. #1884
[CHANGE] Default values have changed for the following settings. This improves query performance for recent data (within 12h) by only reading from ingesters: #1909 #1921
- -blocks-storage.bucket-store.ignore-blocks-within now defaults to 10h (previously 0)
- -querier.query-store-after now defaults to 12h (previously 0)
[CHANGE] Alertmanager: removed support for migrating local files from Cortex 1.8 or earlier. Related to original Cortex PR cortexproject/cortex#3910. #2253
[CHANGE] The following settings are now classified as advanced because the defaults should work for most users and tuning them requires in-depth knowledge of how the read path works: #1929
- -querier.query-ingesters-within
- -querier.query-store-after
[CHANGE] Config flag category overrides can be set dynamically at runtime. #1934
[CHANGE] Ingester: deprecated -ingester.ring.join-after. Mimir now behaves as this setting is always set to 0s. This configuration option will be removed in Mimir 2.4.0. #1965
[CHANGE] Blocks uploaded by ingester no longer contain __org_id__ label. Compactor now ignores this label and will compact blocks with and without this label together. mimirconvert tool will remove the label from blocks as "unknown" label. #1972
[CHANGE] Querier: deprecated -querier.shuffle-sharding-ingesters-lookback-period, instead adding -querier.shuffle-sharding-ingesters-enabled to enable or disable shuffle sharding on the read path. The value of -querier.query-ingesters-within is now used internally for shuffle sharding lookback. #2110
[CHANGE] Memberlist: -memberlist.abort-if-join-fails now defaults to false. Previously it defaulted to true. #2168
[CHANGE] Ruler: /api/v1/rules* and /prometheus/rules* configuration endpoints are removed. Use /prometheus/config/v1/rules*. #2182
[CHANGE] Ingester: -ingester.exemplars-update-period has been renamed to -ingester.tsdb-config-update-period. You can use it to update multiple, per-tenant TSDB configurations. #2187
[FEATURE] Ingester: (Experimental) Add the ability to ingest out-of-order samples up to an allowed limit. If you enable this feature, it requires additional memory and disk space. This feature also enables a write-behind log, which might lead to longer ingester-start replays. When this feature is disabled, there is no overhead on memory, disk space, or startup times. #2187
- -ingester.out-of-order-time-window, as duration string, allows you to set how back in time a sample can be. The default is 0s, where s is seconds.
- cortex_ingester_tsdb_out_of_order_samples_appended_total metric tracks the total number of out-of-order samples ingested by the ingester.
- cortex_discarded_samples_total has a new label reason="sample-too-old", when the -ingester.out-of-order-time-window flag is greater than zero. The label tracks the number of samples that were discarded for being too old; they were out of order, but beyond the time window allowed. The labels reason="sample-out-of-order" and reason="sample-out-of-bounds" are not used when out-of-order ingestion is enabled.
[ENHANCEMENT] Distributor: Added limit to prevent tenants from sending excessive number of requests: #1843
- The following CLI flags (and their respective YAML config options) have been added:
  - -distributor.request-rate-limit
  - -distributor.request-burst-limit
- The following metric is exposed to tell how many requests have been rejected:
  - cortex_discarded_requests_total
[ENHANCEMENT] Store-gateway: Add the experimental ability to run requests in a dedicated OS thread pool. This feature can be configured using -store-gateway.thread-pool-size and is disabled by default. Replaces the ability to run index header operations in a dedicated thread pool. #1660 #1812
[ENHANCEMENT] Improved error messages to make them easier to understand; each now have a unique, global identifier that you can use to look up in the runbooks for more information. #1907 #1919 #1888 #1939 #1984 #2009 #2056 #2066 #2104 #2150 #2234
[ENHANCEMENT] Memberlist KV: incoming messages are now processed on per-key goroutine. This may reduce loss of "maintanance" packets in busy memberlist installations, but use more CPU. New memberlist_client_received_broadcasts_dropped_total counter tracks number of dropped per-key messages. #1912
[ENHANCEMENT] Blocks Storage, Alertmanager, Ruler: add support a prefix to the bucket store (*_storage.storage_prefix). This enables using the same bucket for the three components. #1686 #1951
[ENHANCEMENT] Upgrade Docker base images to alpine:3.16.0. #2028
[ENHANCEMENT] Store-gateway: Add experimental configuration option for the store-gateway to attempt to pre-populate the file system cache when memory-mapping index-header files. Enabled with -blocks-storage.bucket-store.index-header.map-populate-enabled=true. Note this flag only has an effect when running on Linux. #2019 #2054
[ENHANCEMENT] Chunk Mapper: reduce memory usage of async chunk mapper. #2043
[ENHANCEMENT] Ingester: reduce sleep time when reading WAL. #2098
[ENHANCEMENT] Compactor: Run sanity check on blocks storage configuration at startup. #2144
[ENHANCEMENT] Compactor: Add HTTP API for uploading TSDB blocks. Enabled with -compactor.block-upload-enabled. #1694 #2126
[ENHANCEMENT] Ingester: Enable querying overlapping blocks by default. #2187
[ENHANCEMENT] Distributor: Auto-forget unhealthy distributors after ten failed ring heartbeats. #2154
[ENHANCEMENT] Distributor: Add new metric cortex_distributor_forward_errors_total for error codes resulting from forwarding requests. #2077
[ENHANCEMENT] /ready endpoint now returns and logs detailed services information. #2055
[ENHANCEMENT] Memcached client: Reduce number of connections required to fetch cached keys from memcached. #1920
[ENHANCEMENT] Improved error message returned when -querier.query-store-after validation fails. #1914
[BUGFIX] Fix regexp parsing panic for regexp label matchers with start/end quantifiers. #1883
[BUGFIX] Ingester: fixed deceiving error log "failed to update cached shipped blocks after shipper initialisation", occurring for each new tenant in the ingester. #1893
[BUGFIX] Ring: fix bug where instances may appear unhealthy in the hash ring web UI even though they are not. #1933
[BUGFIX] API: gzip is now enforced when identity encoding is explicitly rejected. #1864
[BUGFIX] Fix panic at startup when Mimir is running in monolithic mode and query sharding is enabled. #2036
[BUGFIX] Ruler: report cortex_ruler_queries_failed_total metric for any remote query error except 4xx when remote operational mode is enabled. #2053 #2143
[BUGFIX] Ingester: fix slow rollout when using -ingester.ring.unregister-on-shutdown=false with long -ingester.ring.heartbeat-period. #2085
[BUGFIX] Ruler: add timeout for remote rule evaluation queries to prevent rule group evaluations getting stuck indefinitely. The duration is configurable with -querier.timeout (default 2m). #2090 #2222
[BUGFIX] Limits: Active series custom tracker configuration has been named back from active_series_custom_trackers_config to active_series_custom_trackers. For backwards compatibility both version is going to be supported for until Mimir v2.4. When both fields are specified, active_series_custom_trackers_config takes precedence over active_series_custom_trackers. #2101
[BUGFIX] Ingester: fixed the order of labels applied when incrementing the cortex_discarded_metadata_total metric. #2096
[BUGFIX] Ingester: fixed bug where retrieving metadata for a metric with multiple metadata entries would return multiple copies of a single metadata entry rather than all available entries. #2096
[BUGFIX] Distributor: canceled requests are no longer accounted as internal errors. #2157
[BUGFIX] Memberlist: Fix typo in memberlist admin UI. #2202
[BUGFIX] Ruler: fixed typo in error message when ruler failed to decode a rule group. #2151
[BUGFIX] Active series custom tracker configuration is now displayed properly on /runtime_config page. #2065
[BUGFIX] Query-frontend: vector and time functions were sharded, which made expressions like vector(1) > 0 and vector(1) fail. #2355

Mixin

[CHANGE] Split mimir_queries rules group into mimir_queries and mimir_ingester_queries to keep number of rules per group within the default per-tenant limit. #1885
[CHANGE] Dashboards: Expose full image tag in "Mimir / Rollout progress" dashboard's "Pod per version panel." #1932
[CHANGE] Dashboards: Disabled gateway panels by default, because most users don't have a gateway exposing the metrics expected by Mimir dashboards. You can re-enable it setting gateway_enabled: true in the mixin config and recompiling the mixin running make build-mixin. #1955
[CHANGE] Alerts: adapt MimirFrontendQueriesStuck and MimirSchedulerQueriesStuck to consider ruler query path components. #1949
[CHANGE] Alerts: Change MimirRulerTooManyFailedQueries severity to critical. #2165
[ENHANCEMENT] Dashboards: Add config option datasource_regex to customise the regular expression used to select valid datasources for Mimir dashboards. #1802
[ENHANCEMENT] Dashboards: Added "Mimir / Remote ruler reads" and "Mimir / Remote ruler reads resources" dashboards. #1911 #1937
[ENHANCEMENT] Dashboards: Make networking panels work for pods created by the mimir-distributed helm chart. #1927
[ENHANCEMENT] Alerts: Add MimirStoreGatewayNoSyncedTenants alert that fires when there is a store-gateway owning no tenants. #1882
[ENHANCEMENT] Rules: Make recording_rules_range_interval configurable for cases where Mimir metrics are scraped less often that every 30 seconds. #2118
[ENHANCEMENT] Added minimum Grafana version to mixin dashboards. #1943
[BUGFIX] Fix container_memory_usage_bytes:sum recording rule. #1865
[BUGFIX] Fix MimirGossipMembersMismatch alerts if Mimir alertmanager is activated. #1870
[BUGFIX] Fix MimirRulerMissedEvaluations to show % of missed alerts as a value between 0 and 100 instead of 0 and 1. #1895
[BUGFIX] Fix MimirCompactorHasNotUploadedBlocks alert false positive when Mimir is deployed in monolithic mode. #1902
[BUGFIX] Fix MimirGossipMembersMismatch to make it less sensitive during rollouts and fire one alert per installation, not per job. #1926
[BUGFIX] Do not trigger MimirAllocatingTooMuchMemory alerts if no container limits are supplied. #1905
[BUGFIX] Dashboards: Remove empty "Chunks per query" panel from Mimir / Queries dashboard. #1928
[BUGFIX] Dashboards: Use Grafana's $__rate_interval for rate queries in dashboards to support scrape intervals of >15s. #2011
[BUGFIX] Alerts: Make each version of MimirCompactorHasNotUploadedBlocks distinct to avoid rule evaluation failures due to duplicate series being generated. #2197
[BUGFIX] Fix MimirGossipMembersMismatch alert when using remote ruler evaluation. #2159

Jsonnet

[CHANGE] Remove use of -querier.query-store-after, -querier.shuffle-sharding-ingesters-lookback-period, -blocks-storage.bucket-store.ignore-blocks-within, and -blocks-storage.tsdb.close-idle-tsdb-timeout CLI flags since the values now match defaults. #1915 #1921
[CHANGE] Change default value for -blocks-storage.bucket-store.chunks-cache.memcached.timeout to 450ms to increase use of cached data. #2035
[CHANGE] The memberlist_ring_enabled configuration now applies to Alertmanager. #2102 #2103 #2107
[CHANGE] Default value for memberlist_ring_enabled is now true. It means that all hash rings use Memberlist as default KV store instead of Consul (previous default). #2161
[CHANGE] Configure -ingester.max-global-metadata-per-user to correspond to 20% of the configured max number of series per tenant. #2250
[CHANGE] Configure -ingester.max-global-metadata-per-metric to be 10. #2250
[CHANGE] Change _config.multi_zone_ingester_max_unavailable to 25. #2251
[FEATURE] Added querier autoscaling support. It requires KEDA installed in the Kubernetes cluster and query-scheduler enabled in the Mimir cluster. Querier autoscaler can be enabled and configure through the following options in the jsonnet config: #2013 #2023
- autoscaling_querier_enabled: true to enable autoscaling.
- autoscaling_querier_min_replicas: minimum number of querier replicas.
- autoscaling_querier_max_replicas: maximum number of querier replicas.
- autoscaling_prometheus_url: Prometheus base URL from which to scrape Mimir metrics (e.g. http://prometheus.default:9090/prometheus).
[FEATURE] Jsonnet: Add support for ruler remote evaluation mode (ruler_remote_evaluation_enabled), which deploys and uses a dedicated query path for rule evaluation. This enables the benefits of the query-frontend for rule evaluation, such as query sharding. #2073
[ENHANCEMENT] Added compactor service, that can be used to route requests directly to compactor (e.g. admin UI). #2063
[ENHANCEMENT] Added a consul_enabled configuration option to provide the ability to disable consul. It is automatically set to false when memberlist_ring_enabled is true and multikv_migration_enabled (used for migration from Consul to memberlist) is not set. #2093 #2152
[BUGFIX] Querier: Fix disabling shuffle sharding on the read path whilst keeping it enabled on write path. #2164

Mimirtool

[CHANGE] mimirtool rules: --use-legacy-routes now toggles between using /prometheus/config/v1/rules (default) and /api/v1/rules (legacy) endpoints. #2182
[FEATURE] Added bearer token support for when Mimir is behind a gateway authenticating by bearer token. #2146
[BUGFIX] mimirtool analyze: Fix dashboard JSON unmarshalling errors (#1840). #1973
[BUGFIX] Make mimirtool build for Windows work again. #2273

Mimir Continuous Test

[ENHANCEMENT] Added the -tests.smoke-test flag to run the mimir-continuous-test suite once and immediately exit. #2047 #2094
[ENHANCEMENT] Added the -tests.write-protocol flag to write using the prometheus remote write protocol or otlp-http in the mimir-continuous-test suite. #5719

Documentation

[ENHANCEMENT] Published Grafana Mimir runbooks as part of documentation. #1970
[ENHANCEMENT] Improved ruler's "remote operational mode" documentation. #1906
[ENHANCEMENT] Recommend fast disks for ingesters and store-gateways in production tips. #1903
[ENHANCEMENT] Explain the runtime override of active series matchers. #1868
[ENHANCEMENT] Clarify "Set rule group" API specification. #1869
[ENHANCEMENT] Published Mimir jsonnet documentation. #2024
[ENHANCEMENT] Documented required scrape interval for using alerting and recording rules from Mimir jsonnet. #2147
[ENHANCEMENT] Runbooks: Mention memberlist as possible source of problems for various alerts. #2158
[ENHANCEMENT] Added step-by-step article about migrating from Consul to Memberlist KV store using jsonnet without downtime. #2166
[ENHANCEMENT] Documented /memberlist admin page. #2166
[ENHANCEMENT] Documented how to configure Grafana Mimir's ruler with Jsonnet. #2127
[ENHANCEMENT] Documented how to configure queriers’ autoscaling with Jsonnet. #2128
[ENHANCEMENT] Updated mixin building instructions in "Installing Grafana Mimir dashboards and alerts" article. #2015 #2163
[ENHANCEMENT] Fix location of "Monitoring Grafana Mimir" article in the documentation hierarchy. #2130
[ENHANCEMENT] Runbook for MimirRequestLatency was expanded with more practical advice. #1967
[BUGFIX] Fixed ruler configuration used in the getting started guide. #2052
[BUGFIX] Fixed Mimir Alertmanager datasource in Grafana used by "Play with Grafana Mimir" tutorial. #2115
[BUGFIX] Fixed typos in "Scaling out Grafana Mimir" article. #2170
[BUGFIX] Added missing ring endpoint exposed by Ingesters. #1918

2.1.0

Grafana Mimir

[CHANGE] Compactor: No longer upload debug meta files to object storage. #1257
[CHANGE] Default values have changed for the following settings: #1547
- -alertmanager.alertmanager-client.grpc-max-recv-msg-size now defaults to 100 MiB (previously was not configurable and set to 16 MiB)
- -alertmanager.alertmanager-client.grpc-max-send-msg-size now defaults to 100 MiB (previously was not configurable and set to 4 MiB)
- -alertmanager.max-recv-msg-size now defaults to 100 MiB (previously was 16 MiB)
[CHANGE] Ingester: Add user label to metrics cortex_ingester_ingested_samples_total and cortex_ingester_ingested_samples_failures_total. #1533
[CHANGE] Ingester: Changed -blocks-storage.tsdb.isolation-enabled default from true to false. The config option has also been deprecated and will be removed in 2 minor version. #1655
[CHANGE] Query-frontend: results cache keys are now versioned, this will cause cache to be re-filled when rolling out this version. #1631
[CHANGE] Store-gateway: enabled attributes in-memory cache by default. New default configuration is -blocks-storage.bucket-store.chunks-cache.attributes-in-memory-max-items=50000. #1727
[CHANGE] Compactor: Removed the metric cortex_compactor_garbage_collected_blocks_total since it duplicates cortex_compactor_blocks_marked_for_deletion_total. #1728
[CHANGE] All: Logs that used theorg_id label now use user label. #1634 #1758
[CHANGE] Alertmanager: the following metrics are not exported for a given user and integration when the metric value is zero: #1783
- cortex_alertmanager_notifications_total
- cortex_alertmanager_notifications_failed_total
- cortex_alertmanager_notification_requests_total
- cortex_alertmanager_notification_requests_failed_total
- cortex_alertmanager_notification_rate_limited_total
[CHANGE] Removed the following metrics exposed by the Mimir hash rings: #1791
- cortex_member_ring_tokens_owned
- cortex_member_ring_tokens_to_own
- cortex_ring_tokens_owned
- cortex_ring_member_ownership_percent
[CHANGE] Querier / Ruler: removed the following metrics tracking number of query requests send to each ingester. You can use cortex_request_duration_seconds_count{route=~"/cortex.Ingester/(QueryStream|QueryExemplars)"} instead. #1797
- cortex_distributor_ingester_queries_total
- cortex_distributor_ingester_query_failures_total
[CHANGE] Distributor: removed the following metrics tracking the number of requests from a distributor to ingesters: #1799
- cortex_distributor_ingester_appends_total
- cortex_distributor_ingester_append_failures_total
[CHANGE] Distributor / Ruler: deprecated -distributor.extend-writes. Now Mimir always behaves as if this setting was set to false, which we expect to be safe for every Mimir cluster setup. #1856
[FEATURE] Querier: Added support for streaming remote read. Should be noted that benefits of chunking the response are partial here, since in a typical query-frontend setup responses will be buffered until they've been completed. #1735
[FEATURE] Ruler: Allow setting evaluation_delay for each rule group via rules group configuration file. #1474
[FEATURE] Ruler: Added support for expression remote evaluation. #1536 #1818
- The following CLI flags (and their respective YAML config options) have been added:
  - -ruler.query-frontend.address
  - -ruler.query-frontend.grpc-client-config.grpc-max-recv-msg-size
  - -ruler.query-frontend.grpc-client-config.grpc-max-send-msg-size
  - -ruler.query-frontend.grpc-client-config.grpc-compression
  - -ruler.query-frontend.grpc-client-config.grpc-client-rate-limit
  - -ruler.query-frontend.grpc-client-config.grpc-client-rate-limit-burst
  - -ruler.query-frontend.grpc-client-config.backoff-on-ratelimits
  - -ruler.query-frontend.grpc-client-config.backoff-min-period
  - -ruler.query-frontend.grpc-client-config.backoff-max-period
  - -ruler.query-frontend.grpc-client-config.backoff-retries
  - -ruler.query-frontend.grpc-client-config.tls-enabled
  - -ruler.query-frontend.grpc-client-config.tls-ca-path
  - -ruler.query-frontend.grpc-client-config.tls-cert-path
  - -ruler.query-frontend.grpc-client-config.tls-key-path
  - -ruler.query-frontend.grpc-client-config.tls-server-name
  - -ruler.query-frontend.grpc-client-config.tls-insecure-skip-verify
[FEATURE] Distributor: Added the ability to forward specifics metrics to alternative remote_write API endpoints. #1052
[FEATURE] Ingester: Active series custom trackers now supports runtime tenant-specific overrides. The configuration has been moved to limit config, the ingester config has been deprecated. #1188
[ENHANCEMENT] Alertmanager API: Concurrency limit for GET requests is now configurable using -alertmanager.max-concurrent-get-requests-per-tenant. #1547
[ENHANCEMENT] Alertmanager: Added the ability to configure additional gRPC client settings for the Alertmanager distributor #1547
- -alertmanager.alertmanager-client.backoff-max-period
- -alertmanager.alertmanager-client.backoff-min-period
- -alertmanager.alertmanager-client.backoff-on-ratelimits
- -alertmanager.alertmanager-client.backoff-retries
- -alertmanager.alertmanager-client.grpc-client-rate-limit
- -alertmanager.alertmanager-client.grpc-client-rate-limit-burst
- -alertmanager.alertmanager-client.grpc-compression
- -alertmanager.alertmanager-client.grpc-max-recv-msg-size
- -alertmanager.alertmanager-client.grpc-max-send-msg-size
[ENHANCEMENT] Ruler: Add more detailed query information to ruler query stats logging. #1411
[ENHANCEMENT] Admin: Admin API now has some styling. #1482 #1549 #1821 #1824
[ENHANCEMENT] Alertmanager: added insight=true field to alertmanager dispatch logs. #1379
[ENHANCEMENT] Store-gateway: Add the experimental ability to run index header operations in a dedicated thread pool. This feature can be configured using -blocks-storage.bucket-store.index-header-thread-pool-size and is disabled by default. #1660
[ENHANCEMENT] Store-gateway: don't drop all blocks if instance finds itself as unhealthy or missing in the ring. #1806 #1823
[ENHANCEMENT] Querier: wait until inflight queries are completed when shutting down queriers. #1756 #1767
[BUGFIX] Query-frontend: do not shard queries with a subquery unless the subquery is inside a shardable aggregation function call. #1542
[BUGFIX] Query-frontend: added component=query-frontend label to results cache memcached metrics to fix a panic when Mimir is running in single binary mode and results cache is enabled. #1704
[BUGFIX] Mimir: services' status content-type is now correctly set to text/html. #1575
[BUGFIX] Multikv: Fix panic when using using runtime config to set primary KV store used by multi KV. #1587
[BUGFIX] Multikv: Fix watching for runtime config changes in multi KV store in ruler and querier. #1665
[BUGFIX] Memcached: allow to use CNAME DNS records for the memcached backend addresses. #1654
[BUGFIX] Querier: fixed temporary partial query results when shuffle sharding is enabled and hash ring backend storage is flushed / reset. #1829
[BUGFIX] Alertmanager: prevent more file traversal cases related to template names. #1833
[BUGFUX] Alertmanager: Allow usage with -alertmanager-storage.backend=local. Note that when using this storage type, the Alertmanager is not able persist state remotely, so it not recommended for production use. #1836
[BUGFIX] Alertmanager: Do not validate alertmanager configuration if it's not running. #1835

Mixin

[CHANGE] Dashboards: Remove per-user series legends from Tenants dashboard. #1605
[CHANGE] Dashboards: Show in-memory series and the per-user series limit on Tenants dashboard. #1613
[CHANGE] Dashboards: Slow-queries dashboard now uses user label from logs instead of org_id. #1634
[CHANGE] Dashboards: changed all Grafana dashboards UIDs to not conflict with Cortex ones, to let people install both while migrating from Cortex to Mimir: #1801 #1808
- Alertmanager from a76bee5913c97c918d9e56a3cc88cc28 to b0d38d318bbddd80476246d4930f9e55
- Alertmanager Resources from 68b66aed90ccab448009089544a8d6c6 to a6883fb22799ac74479c7db872451092
- Compactor from 9c408e1d55681ecb8a22c9fab46875cc to 1b3443aea86db629e6efdb7d05c53823
- Compactor Resources from df9added6f1f4332f95848cca48ebd99 to 09a5c49e9cdb2f2b24c6d184574a07fd
- Config from 61bb048ced9817b2d3e07677fb1c6290 to 5d9d0b4724c0f80d68467088ec61e003
- Object Store from d5a3a4489d57c733b5677fb55370a723 to e1324ee2a434f4158c00a9ee279d3292
- Overrides from b5c95fee2e5e7c4b5930826ff6e89a12 to 1e2c358600ac53f09faea133f811b5bb
- Queries from d9931b1054053c8b972d320774bb8f1d to b3abe8d5c040395cc36615cb4334c92d
- Reads from 8d6ba60eccc4b6eedfa329b24b1bd339 to e327503188913dc38ad571c647eef643
- Reads Networking from c0464f0d8bd026f776c9006b05910000 to 54b2a0a4748b3bd1aefa92ce5559a1c2
- Reads Resources from 2fd2cda9eea8d8af9fbc0a5960425120 to cc86fd5aa9301c6528986572ad974db9
- Rollout Progress from 7544a3a62b1be6ffd919fc990ab8ba8f to 7f0b5567d543a1698e695b530eb7f5de
- Ruler from 44d12bcb1f95661c6ab6bc946dfc3473 to 631e15d5d85afb2ca8e35d62984eeaa0
- Scaling from 88c041017b96856c9176e07cf557bdcf to 64bbad83507b7289b514725658e10352
- Slow queries from e6f3091e29d2636e3b8393447e925668 to 6089e1ce1e678788f46312a0a1e647e6
- Tenants from 35fa247ce651ba189debf33d7ae41611 to 35fa247ce651ba189debf33d7ae41611
- Top Tenants from bc6e12d4fe540e4a1785b9d3ca0ffdd9 to bc6e12d4fe540e4a1785b9d3ca0ffdd9
- Writes from 0156f6d15aa234d452a33a4f13c838e3 to 8280707b8f16e7b87b840fc1cc92d4c5
- Writes Networking from 681cd62b680b7154811fe73af55dcfd4 to 978c1cb452585c96697a238eaac7fe2d
- Writes Resources from c0464f0d8bd026f776c9006b0591bb0b to bc9160e50b52e89e0e49c840fea3d379
[FEATURE] Alerts: added the following alerts on mimir-continuous-test tool: #1676
- MimirContinuousTestNotRunningOnWrites
- MimirContinuousTestNotRunningOnReads
- MimirContinuousTestFailed
[ENHANCEMENT] Added per_cluster_label support to allow to change the label name used to differentiate between Kubernetes clusters. #1651
[ENHANCEMENT] Dashboards: Show QPS and latency of the Alertmanager Distributor. #1696
[ENHANCEMENT] Playbooks: Add Alertmanager suggestions for MimirRequestErrors and MimirRequestLatency #1702
[ENHANCEMENT] Dashboards: Allow custom datasources. #1749
[ENHANCEMENT] Dashboards: Add config option gateway_enabled (defaults to true) to disable gateway panels from dashboards. #1761
[ENHANCEMENT] Dashboards: Extend Top tenants dashboard with queries for tenants with highest sample rate, discard rate, and discard rate growth. #1842
[ENHANCEMENT] Dashboards: Show ingestion rate limit and rule group limit on Tenants dashboard. #1845
[ENHANCEMENT] Dashboards: Add "last successful run" panel to compactor dashboard. #1628
[BUGFIX] Dashboards: Fix "Failed evaluation rate" panel on Tenants dashboard. #1629
[BUGFIX] Honor the configured per_instance_label in all dashboards and alerts. #1697

Jsonnet

[FEATURE] Added support for mimir-continuous-test. To deploy mimir-continuous-test you can use the following configuration: #1675 #1850

_config+: {
  continuous_test_enabled: true,
  continuous_test_tenant_id: 'type-tenant-id',
  continuous_test_write_endpoint: 'http://type-write-path-hostname',
  continuous_test_read_endpoint: 'http://type-read-path-hostname/prometheus',
},

[ENHANCEMENT] Ingester anti-affinity can now be disabled by using ingester_allow_multiple_replicas_on_same_node configuration key. #1581
[ENHANCEMENT] Added node_selector configuration option to select Kubernetes nodes where Mimir should run. #1596
[ENHANCEMENT] Alertmanager: Added a PodDisruptionBudget of withMaxUnavailable = 1, to ensure we maintain quorum during rollouts. #1683
[ENHANCEMENT] Store-gateway anti-affinity can now be enabled/disabled using store_gateway_allow_multiple_replicas_on_same_node configuration key. #1730
[ENHANCEMENT] Added store_gateway_zone_a_args, store_gateway_zone_b_args and store_gateway_zone_c_args configuration options. #1807
[BUGFIX] Pass primary and secondary multikv stores via CLI flags. Introduced new multikv_switch_primary_secondary config option to flip primary and secondary in runtime config.

Mimirtool

[BUGFIX] config convert: Retain Cortex defaults for blocks_storage.backend, ruler_storage.backend, alertmanager_storage.backend, auth.type, activity_tracker.filepath, alertmanager.data_dir, blocks_storage.filesystem.dir, compactor.data_dir, ruler.rule_path, ruler_storage.filesystem.dir, and graphite.querier.schemas.backend. #1626 #1762

Tools

[FEATURE] Added a markblocks tool that creates no-compact and delete marks for the blocks. #1551
[FEATURE] Added mimir-continuous-test tool to continuously run smoke tests on live Mimir clusters. #1535 #1540 #1653 #1603 #1630 #1691 #1675 #1676 #1692 #1706 #1709 #1775 #1777 #1778 #1795
[FEATURE] Added mimir-rules-action GitHub action, located at operations/mimir-rules-action/, used to lint, prepare, verify, diff, and sync rules to a Mimir cluster. #1723

2.0.0

Grafana Mimir

Changes since Cortex 1.10.0.

[CHANGE] Remove chunks storage engine. #86 #119 #510 #545 #743 #744 #748 #753 #755 #757 #758 #759 #760 #762 #764 #789 #812 #813
- The following CLI flags (and their respective YAML config options) have been removed:
  - -store.engine
  - -schema-config-file
  - -ingester.checkpoint-duration
  - -ingester.checkpoint-enabled
  - -ingester.chunk-encoding
  - -ingester.chunk-age-jitter
  - -ingester.concurrent-flushes
  - -ingester.flush-on-shutdown-with-wal-enabled
  - -ingester.flush-op-timeout
  - -ingester.flush-period
  - -ingester.max-chunk-age
  - -ingester.max-chunk-idle
  - -ingester.max-series-per-query (and max_series_per_query from runtime config)
  - -ingester.max-stale-chunk-idle
  - -ingester.max-transfer-retries
  - -ingester.min-chunk-length
  - -ingester.recover-from-wal
  - -ingester.retain-period
  - -ingester.spread-flushes
  - -ingester.wal-dir
  - -ingester.wal-enabled
  - -querier.query-parallelism
  - -querier.second-store-engine
  - -querier.use-second-store-before-time
  - -flusher.wal-dir
  - -flusher.concurrent-flushes
  - -flusher.flush-op-timeout
  - All -table-manager.* flags
  - All -deletes.* flags
  - All -purger.* flags
  - All -metrics.* flags
  - All -dynamodb.* flags
  - All -s3.* flags
  - All -azure.* flags
  - All -bigtable.* flags
  - All -gcs.* flags
  - All -cassandra.* flags
  - All -boltdb.* flags
  - All -local.* flags
  - All -swift.* flags
  - All -store.* flags except -store.engine, -store.max-query-length, -store.max-labels-query-length
  - All -grpc-store.* flags
- The following API endpoints have been removed:
  - /api/v1/chunks and /chunks
- The following metrics have been removed:
  - cortex_ingester_flush_queue_length
  - cortex_ingester_queried_chunks
  - cortex_ingester_chunks_created_total
  - cortex_ingester_wal_replay_duration_seconds
  - cortex_ingester_wal_corruptions_total
  - cortex_ingester_sent_chunks
  - cortex_ingester_received_chunks
  - cortex_ingester_flush_series_in_progress
  - cortex_ingester_chunk_utilization
  - cortex_ingester_chunk_length
  - cortex_ingester_chunk_size_bytes
  - cortex_ingester_chunk_age_seconds
  - cortex_ingester_memory_chunks
  - cortex_ingester_flushing_enqueued_series_total
  - cortex_ingester_flushing_dequeued_series_total
  - cortex_ingester_dropped_chunks_total
  - cortex_oldest_unflushed_chunk_timestamp_seconds
  - prometheus_local_storage_chunk_ops_total
  - prometheus_local_storage_chunkdesc_ops_total
  - prometheus_local_storage_memory_chunkdescs
[CHANGE] Changed default storage backends from s3 to filesystem #833 This effects the following flags:
- -blocks-storage.backend now defaults to filesystem
- -blocks-storage.filesystem.dir now defaults to blocks
- -alertmanager-storage.backend now defaults to filesystem
- -alertmanager-storage.filesystem.dir now defaults to alertmanager
- -ruler-storage.backend now defaults to filesystem
- -ruler-storage.filesystem.dir now defaults to ruler
[CHANGE] Renamed metric cortex_experimental_features_in_use_total as cortex_experimental_features_used_total and added feature label. #32 #658
[CHANGE] Removed log_messages_total metric. #32
[CHANGE] Some files and directories created by Mimir components on local disk now have stricter permissions, and are only readable by owner, but not group or others. #58
[CHANGE] Memcached client DNS resolution switched from golang built-in to miekg/dns. #142
[CHANGE] The metric cortex_deprecated_flags_inuse_total has been renamed to deprecated_flags_inuse_total as part of using grafana/dskit functionality. #185
[CHANGE] API: The -api.response-compression-enabled flag has been removed, and GZIP response compression is always enabled except on /api/v1/push and /push endpoints. #880
[CHANGE] Update Go version to 1.17.3. #480
[CHANGE] The status_code label on gRPC client metrics has changed from '200' and '500' to '2xx', '5xx', '4xx', 'cancel' or 'error'. #537
[CHANGE] Removed the deprecated -<prefix>.fifocache.size flag. #618
[CHANGE] Enable index header lazy loading by default. #693
- -blocks-storage.bucket-store.index-header-lazy-loading-enabled default from false to true
- -blocks-storage.bucket-store.index-header-lazy-loading-idle-timeout default from 20m to 1h
[CHANGE] Shuffle-sharding:
- -distributor.sharding-strategy option has been removed, and shuffle sharding is enabled by default. Default shard size is set to 0, which disables shuffle sharding for the tenant (all ingesters will receive tenants's samples). #888
- -ruler.sharding-strategy option has been removed from ruler. Ruler now uses shuffle-sharding by default, but respects ruler_tenant_shard_size, which defaults to 0 (ie. use all rulers for tenant). #889
- -store-gateway.sharding-strategy option has been removed store-gateways. Store-gateway now uses shuffle-sharding by default, but respects store_gateway_tenant_shard_size for tenant, and this value defaults to 0. #891
[CHANGE] Server: -server.http-listen-port (yaml: server.http_listen_port) now defaults to 8080 (previously 80). #871
[CHANGE] Changed the default value of -blocks-storage.bucket-store.ignore-deletion-marks-delay from 6h to 1h. #892
[CHANGE] Changed default settings for memcached clients: #959 #1000
- The default value for the following config options has changed from 10000 to 25000:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-async-buffer-size
  - -blocks-storage.bucket-store.index-cache.memcached.max-async-buffer-size
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-async-buffer-size
  - -query-frontend.results-cache.memcached.max-async-buffer-size
- The default value for the following config options has changed from 0 (unlimited) to 100:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-get-multi-batch-size
  - -blocks-storage.bucket-store.index-cache.memcached.max-get-multi-batch-size
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-get-multi-batch-size
  - -query-frontend.results-cache.memcached.max-get-multi-batch-size
- The default value for the following config options has changed from 16 to 100:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-idle-connections
  - -blocks-storage.bucket-store.index-cache.memcached.max-idle-connections
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-idle-connections
  - -query-frontend.results-cache.memcached.max-idle-connections
- The default value for the following config options has changed from 100ms to 200ms:
  - -blocks-storage.bucket-store.metadata-cache.memcached.timeout
  - -blocks-storage.bucket-store.index-cache.memcached.timeout
  - -blocks-storage.bucket-store.chunks-cache.memcached.timeout
  - -query-frontend.results-cache.memcached.timeout
[CHANGE] Changed the default value of -blocks-storage.bucket-store.bucket-index.enabled to true. The default configuration must now run the compactor in order to write the bucket index or else queries to long term storage will fail. #924
[CHANGE] Option -auth.enabled has been renamed to -auth.multitenancy-enabled. #1130
[CHANGE] Default tenant ID used with disabled auth (-auth.multitenancy-enabled=false) has changed from fake to anonymous. This tenant ID can now be changed with -auth.no-auth-tenant option. #1063
[CHANGE] The default values for the following local directories have changed: #1072
- -alertmanager.storage.path default value changed to ./data-alertmanager/
- -compactor.data-dir default value changed to ./data-compactor/
- -ruler.rule-path default value changed to ./data-ruler/
[CHANGE] The default value for gRPC max send message size has been changed from 16MB to 100MB. This affects the following parameters: #1152
- -query-frontend.grpc-client-config.grpc-max-send-msg-size
- -ingester.client.grpc-max-send-msg-size
- -querier.frontend-client.grpc-max-send-msg-size
- -query-scheduler.grpc-client-config.grpc-max-send-msg-size
- -ruler.client.grpc-max-send-msg-size
[CHANGE] Remove -http.prefix flag (and http_prefix config file option). #763

[CHANGE] Remove legacy endpoints. Please use their alternatives listed below. As part of the removal process we are introducing two new sets of endpoints for the ruler configuration API: <prometheus-http-prefix>/rules and <prometheus-http-prefix>/config/v1/rules/**. We are also deprecating <prometheus-http-prefix>/rules and /api/v1/rules; and will remove them in Mimir 2.2.0. #763 #1222

Query endpoints

Legacy	Alternative
`/<legacy-http-prefix>/api/v1/query`	`<prometheus-http-prefix>/api/v1/query`
`/<legacy-http-prefix>/api/v1/query_range`	`<prometheus-http-prefix>/api/v1/query_range`
`/<legacy-http-prefix>/api/v1/query_exemplars`	`<prometheus-http-prefix>/api/v1/query_exemplars`
`/<legacy-http-prefix>/api/v1/series`	`<prometheus-http-prefix>/api/v1/series`
`/<legacy-http-prefix>/api/v1/labels`	`<prometheus-http-prefix>/api/v1/labels`
`/<legacy-http-prefix>/api/v1/label/{name}/values`	`<prometheus-http-prefix>/api/v1/label/{name}/values`
`/<legacy-http-prefix>/api/v1/metadata`	`<prometheus-http-prefix>/api/v1/metadata`
`/<legacy-http-prefix>/api/v1/read`	`<prometheus-http-prefix>/api/v1/read`
`/<legacy-http-prefix>/api/v1/cardinality/label_names`	`<prometheus-http-prefix>/api/v1/cardinality/label_names`
`/<legacy-http-prefix>/api/v1/cardinality/label_values`	`<prometheus-http-prefix>/api/v1/cardinality/label_values`
`/api/prom/user_stats`	`/api/v1/user_stats`

Distributor endpoints

Legacy endpoint Alternative

/<legacy-http-prefix>/push /api/v1/push

/all_user_stats /distributor/all_user_stats

/ha-tracker /distributor/ha_tracker
Ingester endpoints

Legacy Alternative

/ring /ingester/ring

/shutdown /ingester/shutdown

/flush /ingester/flush

/push /ingester/push

Ruler endpoints

Legacy	Alternative	Alternative #2 (not available before Mimir 2.0.0)
`/<legacy-http-prefix>/api/v1/rules`	`<prometheus-http-prefix>/api/v1/rules`
`/<legacy-http-prefix>/api/v1/alerts`	`<prometheus-http-prefix>/api/v1/alerts`
`/<legacy-http-prefix>/rules`	`/api/v1/rules` (see below)	`<prometheus-http-prefix>/config/v1/rules`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/<legacy-http-prefix>/rules/{namespace}/{groupName}`	`/api/v1/rules/{namespace}/{groupName}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}/{groupName}`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/<legacy-http-prefix>/rules/{namespace}/{groupName}`	`/api/v1/rules/{namespace}/{groupName}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}/{groupName}`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/ruler_ring`	`/ruler/ring`

Note: The /api/v1/rules/** endpoints are considered deprecated with Mimir 2.0.0 and will be removed in Mimir 2.2.0. After upgrading to 2.0.0 we recommend switching uses to the equivalent /<prometheus-http-prefix>/config/v1/** endpoints that Mimir 2.0.0 introduces.

Alertmanager endpoints

Legacy Alternative

/<legacy-http-prefix> /alertmanager

/status /multitenant_alertmanager/status

[CHANGE] Ingester: changed -ingester.stream-chunks-when-using-blocks default value from false to true. #717
[CHANGE] Ingester: default -ingester.ring.min-ready-duration reduced from 1m to 15s. #126
[CHANGE] Ingester: -ingester.ring.min-ready-duration now start counting the delay after the ring's health checks have passed instead of when the ring client was started. #126
[CHANGE] Ingester: allow experimental ingester max-exemplars setting to be changed dynamically #144
- CLI flag -blocks-storage.tsdb.max-exemplars is renamed to -ingester.max-global-exemplars-per-user.
- YAML max_exemplars is moved from tsdb to overrides and renamed to max_global_exemplars_per_user.
[CHANGE] Ingester: active series metrics cortex_ingester_active_series and cortex_ingester_active_series_custom_tracker are now removed when their value is zero. #672 #690
[CHANGE] Ingester: changed default value of -blocks-storage.tsdb.retention-period from 6h to 24h. #966
[CHANGE] Ingester: changed default value of -blocks-storage.tsdb.close-idle-tsdb-timeout from 0 to 13h. #967
[CHANGE] Ingester: changed default value of -ingester.ring.final-sleep from 30s to 0s. #981
[CHANGE] Ingester: the following low level settings have been removed: #1153
- -ingester-client.expected-labels
- -ingester-client.expected-samples-per-series
- -ingester-client.expected-timeseries
[CHANGE] Ingester: following command line options related to ingester ring were renamed: #1155
- -consul.* changed to -ingester.ring.consul.*
- -etcd.* changed to -ingester.ring.etcd.*
- -multi.* changed to -ingester.ring.multi.*
- -distributor.excluded-zones changed to -ingester.ring.excluded-zones
- -distributor.replication-factor changed to -ingester.ring.replication-factor
- -distributor.zone-awareness-enabled changed to -ingester.ring.zone-awareness-enabled
- -ingester.availability-zone changed to -ingester.ring.instance-availability-zone
- -ingester.final-sleep changed to -ingester.ring.final-sleep
- -ingester.heartbeat-period changed to -ingester.ring.heartbeat-period
- -ingester.join-after changed to -ingester.ring.join-after
- -ingester.lifecycler.ID changed to -ingester.ring.instance-id
- -ingester.lifecycler.addr changed to -ingester.ring.instance-addr
- -ingester.lifecycler.interface changed to -ingester.ring.instance-interface-names
- -ingester.lifecycler.port changed to -ingester.ring.instance-port
- -ingester.min-ready-duration changed to -ingester.ring.min-ready-duration
- -ingester.num-tokens changed to -ingester.ring.num-tokens
- -ingester.observe-period changed to -ingester.ring.observe-period
- -ingester.readiness-check-ring-health changed to -ingester.ring.readiness-check-ring-health
- -ingester.tokens-file-path changed to -ingester.ring.tokens-file-path
- -ingester.unregister-on-shutdown changed to -ingester.ring.unregister-on-shutdown
- -ring.heartbeat-timeout changed to -ingester.ring.heartbeat-timeout
- -ring.prefix changed to -ingester.ring.prefix
- -ring.store changed to -ingester.ring.store
[CHANGE] Ingester: fields in YAML configuration for ingester ring have been changed: #1155
- ingester.lifecycler changed to ingester.ring
- Fields from ingester.lifecycler.ring moved to ingester.ring
- ingester.lifecycler.address changed to ingester.ring.instance_addr
- ingester.lifecycler.id changed to ingester.ring.instance_id
- ingester.lifecycler.port changed to ingester.ring.instance_port
- ingester.lifecycler.availability_zone changed to ingester.ring.instance_availability_zone
- ingester.lifecycler.interface_names changed to ingester.ring.instance_interface_names
[CHANGE] Distributor: removed the -distributor.shard-by-all-labels configuration option. It is now assumed to be true. #698
[CHANGE] Distributor: change default value of -distributor.instance-limits.max-inflight-push-requests to 2000. #964
[CHANGE] Distributor: change default value of -distributor.remote-timeout from 2s to 20s. #970
[CHANGE] Distributor: removed the -distributor.extra-query-delay flag (and its respective YAML config option). #1048
[CHANGE] Query-frontend: Enable query stats by default, they can still be disabled with -query-frontend.query-stats-enabled=false. #83
[CHANGE] Query-frontend: the cortex_frontend_mapped_asts_total metric has been renamed to cortex_frontend_query_sharding_rewrites_attempted_total. #150
[CHANGE] Query-frontend: added sharded label to cortex_query_seconds_total metric. #235
[CHANGE] Query-frontend: changed the flag name for controlling query sharding total shards from -querier.total-shards to -query-frontend.query-sharding-total-shards. #230
[CHANGE] Query-frontend: flag -querier.parallelise-shardable-queries has been renamed to -query-frontend.parallelize-shardable-queries #284
[CHANGE] Query-frontend: removed the deprecated (and unused) -frontend.cache-split-interval. Use -query-frontend.split-queries-by-interval instead. #587
[CHANGE] Query-frontend: range query response now omits the data field when it's empty (error case) like Prometheus does, previously it was "data":{"resultType":"","result":null}. #629
[CHANGE] Query-frontend: instant queries now honor the -query-frontend.max-retries-per-request flag. #630
[CHANGE] Query-frontend: removed in-memory and Redis cache support. Reason is that these caching backends were just supported by query-frontend, while all other Mimir services only support memcached. #796
- The following CLI flags (and their respective YAML config options) have been removed:
  - -frontend.cache.enable-fifocache
  - -frontend.redis.*
  - -frontend.fifocache.*
- The following metrics have been removed:
  - querier_cache_added_total
  - querier_cache_added_new_total
  - querier_cache_evicted_total
  - querier_cache_entries
  - querier_cache_gets_total
  - querier_cache_misses_total
  - querier_cache_stale_gets_total
  - querier_cache_memory_bytes
  - cortex_rediscache_request_duration_seconds
[CHANGE] Query-frontend: migrated memcached backend client to the same one used in other components (memcached config and metrics are now consistent across all Mimir services). #821
- The following CLI flags (and their respective YAML config options) have been added:
  - -query-frontend.results-cache.backend (set it to memcached if -query-frontend.cache-results=true)
- The following CLI flags (and their respective YAML config options) have been changed:
  - -frontend.memcached.hostname and -frontend.memcached.service have been removed: use -query-frontend.results-cache.memcached.addresses instead
- The following CLI flags (and their respective YAML config options) have been renamed:
  - -frontend.background.write-back-concurrency renamed to -query-frontend.results-cache.memcached.max-async-concurrency
  - -frontend.background.write-back-buffer renamed to -query-frontend.results-cache.memcached.max-async-buffer-size
  - -frontend.memcached.batchsize renamed to -query-frontend.results-cache.memcached.max-get-multi-batch-size
  - -frontend.memcached.parallelism renamed to -query-frontend.results-cache.memcached.max-get-multi-concurrency
  - -frontend.memcached.timeout renamed to -query-frontend.results-cache.memcached.timeout
  - -frontend.memcached.max-item-size renamed to -query-frontend.results-cache.memcached.max-item-size
  - -frontend.memcached.max-idle-conns renamed to -query-frontend.results-cache.memcached.max-idle-connections
  - -frontend.compression renamed to -query-frontend.results-cache.compression
- The following CLI flags (and their respective YAML config options) have been removed:
  - -frontend.memcached.circuit-breaker-consecutive-failures: feature removed
  - -frontend.memcached.circuit-breaker-timeout: feature removed
  - -frontend.memcached.circuit-breaker-interval: feature removed
  - -frontend.memcached.update-interval: new setting is hardcoded to 30s
  - -frontend.memcached.consistent-hash: new setting is always enabled
  - -frontend.default-validity and -frontend.memcached.expiration: new setting is hardcoded to 7 days
- The following metrics have been changed:
  - cortex_cache_dropped_background_writes_total{name} changed to thanos_memcached_operation_skipped_total{name, operation, reason}
  - cortex_cache_value_size_bytes{name, method} changed to thanos_memcached_operation_data_size_bytes{name}
  - cortex_cache_request_duration_seconds{name, method, status_code} changed to thanos_memcached_operation_duration_seconds{name, operation}
  - cortex_cache_fetched_keys{name} changed to thanos_cache_memcached_requests_total{name}
  - cortex_cache_hits{name} changed to thanos_cache_memcached_hits_total{name}
  - cortex_memcache_request_duration_seconds{name, method, status_code} changed to thanos_memcached_operation_duration_seconds{name, operation}
  - cortex_memcache_client_servers{name} changed to thanos_memcached_dns_provider_results{name, addr}
  - cortex_memcache_client_set_skip_total{name} changed to thanos_memcached_operation_skipped_total{name, operation, reason}
  - cortex_dns_lookups_total changed to thanos_memcached_dns_lookups_total
  - For all metrics the value of the "name" label has changed from frontend.memcached to frontend-cache
- The following metrics have been removed:
  - cortex_cache_background_queue_length{name}
[CHANGE] Query-frontend: merged query_range into frontend in the YAML config (keeping the same keys) and renamed flags: #825
- -querier.max-retries-per-request renamed to -query-frontend.max-retries-per-request
- -querier.split-queries-by-interval renamed to -query-frontend.split-queries-by-interval
- -querier.align-querier-with-step renamed to -query-frontend.align-querier-with-step
- -querier.cache-results renamed to -query-frontend.cache-results
- -querier.parallelise-shardable-queries renamed to -query-frontend.parallelize-shardable-queries
[CHANGE] Query-frontend: the default value of -query-frontend.split-queries-by-interval has changed from 0 to 24h. #1131
[CHANGE] Query-frontend: -frontend. flags were renamed to -query-frontend.: #1167
[CHANGE] Query-frontend / Query-scheduler: classified the -query-frontend.querier-forget-delay and -query-scheduler.querier-forget-delay flags (and their respective YAML config options) as experimental. #1208
[CHANGE] Querier / ruler: Change -querier.max-fetched-chunks-per-query configuration to limit to maximum number of chunks that can be fetched in a single query. The number of chunks fetched by ingesters AND long-term storare combined should not exceed the value configured on -querier.max-fetched-chunks-per-query. #4260
[CHANGE] Querier / ruler: Option -querier.ingester-streaming has been removed. Querier/ruler now always use streaming method to query ingesters. #204
[CHANGE] Querier: always fetch labels from store and respect start/end times in request; the option -querier.query-store-for-labels-enabled has been removed and is now always on. #518 #1132
[CHANGE] Querier / ruler: removed the -store.query-chunk-limit flag (and its respective YAML config option max_chunks_per_query). -querier.max-fetched-chunks-per-query (and its respective YAML config option max_fetched_chunks_per_query) should be used instead. #705
[CHANGE] Querier/Ruler: -querier.active-query-tracker-dir option has been removed. Active query tracking is now done via Activity tracker configured by -activity-tracker.filepath and enabled by default. Limit for max number of concurrent queries (-querier.max-concurrent) is now respected even if activity tracking is not enabled. #661 #822
[CHANGE] Querier/ruler/query-frontend: the experimental -querier.at-modifier-enabled CLI flag has been removed and the PromQL @ modifier is always enabled. #941
[CHANGE] Querier: removed -querier.worker-match-max-concurrent and -querier.worker-parallelism CLI flags (and their respective YAML config options). Mimir now behaves like if -querier.worker-match-max-concurrent is always enabled and you should configure the max concurrency per querier process using -querier.max-concurrent instead. #958
[CHANGE] Querier: changed default value of -querier.query-ingesters-within from 0 to 13h. #967
[CHANGE] Querier: rename metric cortex_query_fetched_chunks_bytes_total to cortex_query_fetched_chunk_bytes_total to be consistent with the limit name. #476
[CHANGE] Ruler: add two new metrics cortex_ruler_list_rules_seconds and cortex_ruler_load_rule_groups_seconds to the ruler. #906
[CHANGE] Ruler: endpoints for listing configured rules now return HTTP status code 200 and an empty map when there are no rules instead of an HTTP 404 and plain text error message. The following endpoints are affected: #456
- <prometheus-http-prefix>/config/v1/rules
- <prometheus-http-prefix>/config/v1/rules/{namespace}
- <prometheus-http-prefix>/rules (deprecated)
- <prometheus-http-prefix>/rules/{namespace} (deprecated)
- /api/v1/rules (deprecated)
- /api/v1/rules/{namespace} (deprecated)
[CHANGE] Ruler: removed configdb support from Ruler backend storages. #15 #38 #819
[CHANGE] Ruler: removed the support for the deprecated storage configuration via -ruler.storage.* CLI flags (and their respective YAML config options). Use -ruler-storage.* instead. #628
[CHANGE] Ruler: set new default limits for rule groups: -ruler.max-rules-per-rule-group to 20 (previously 0, disabled) and -ruler.max-rule-groups-per-tenant to 70 (previously 0, disabled). #847
[CHANGE] Ruler: removed -ruler.enable-sharding option, and changed default value of -ruler.ring.store to memberlist. #943
[CHANGE] Ruler: -ruler.alertmanager-use-v2 has been removed. The ruler will always use the v2 endpoints. #954 #1100
[CHANGE] Ruler: -experimental.ruler.enable-api flag has been renamed to -ruler.enable-api and is now stable. The default value has also changed from false to true, so both ruler and alertmanager API are enabled by default. #913 #1065
[CHANGE] Ruler: add support for DNS service discovery format for -ruler.alertmanager-url. -ruler.alertmanager-discovery flag has been removed. URLs following the prior SRV format, will be treated as a static target. To continue using service discovery for these URLs prepend dnssrvnoa+ to them. #993
- The following metrics for Alertmanager DNS service discovery are replaced:
  - prometheus_sd_dns_lookups_total replaced by cortex_dns_lookups_total{component="ruler"}
  - prometheus_sd_dns_lookup_failures_total replaced by cortex_dns_failures_total{component="ruler"}
[CHANGE] Ruler: deprecate /api/v1/rules/** and <prometheus-http-prefix/rules/** configuration API endpoints in favour of /<prometheus-http-prefix>/config/v1/rules/**. Deprecated endpoints will be removed in Mimir 2.2.0. Main configuration API endpoints are now /<prometheus-http-prefix>/config/api/v1/rules/** introduced in Mimir 2.0.0. #1222
[CHANGE] Store-gateway: index cache now includes tenant in cache keys, this invalidates previous cached entries. #607
[CHANGE] Store-gateway: increased memcached index caching TTL from 1 day to 7 days. #718
[CHANGE] Store-gateway: options -store-gateway.sharding-enabled and -querier.store-gateway-addresses were removed. Default value of -store-gateway.sharding-ring.store is now memberlist and default value for -store-gateway.sharding-ring.wait-stability-min-duration changed from 1m to 0 (disabled). #976
[CHANGE] Compactor: compactor will no longer try to compact blocks that are already marked for deletion. Previously compactor would consider blocks marked for deletion within -compactor.deletion-delay / 2 period as eligible for compaction. #4328
[CHANGE] Compactor: Removed support for block deletion marks migration. If you're upgrading from Cortex < 1.7.0 to Mimir, you should upgrade the compactor to Cortex >= 1.7.0 first, run it at least once and then upgrade to Mimir. #122
[CHANGE] Compactor: removed the cortex_compactor_group_vertical_compactions_total metric. #278
[CHANGE] Compactor: no longer waits for initial blocks cleanup to finish before starting compactions. #282
[CHANGE] Compactor: removed overlapping sources detection. Overlapping sources may exist due to edge cases (timing issues) when horizontally sharding compactor, but are correctly handled by compactor. #494
[CHANGE] Compactor: compactor now uses deletion marks from <tenant>/markers location in the bucket. Marker files are no longer fetched, only listed. #550
[CHANGE] Compactor: Default value of -compactor.block-sync-concurrency has changed from 20 to 8. This flag is now only used to control number of goroutines for downloading and uploading blocks during compaction. #552
[CHANGE] Compactor is now included in all target (single-binary). #866
[CHANGE] Compactor: Removed -compactor.sharding-enabled option. Sharding in compactor is now always enabled. Default value of -compactor.ring.store has changed from consul to memberlist. Default value of -compactor.ring.wait-stability-min-duration is now 0, which disables the feature. #956
[CHANGE] Alertmanager: removed -alertmanager.configs.auto-webhook-root #977
[CHANGE] Alertmanager: removed configdb support from Alertmanager backend storages. #15 #38 #819
[CHANGE] Alertmanager: Don't count user-not-found errors from replicas as failures in the cortex_alertmanager_state_fetch_replica_state_failed_total metric. #190
[CHANGE] Alertmanager: Use distributor for non-API routes. #213
[CHANGE] Alertmanager: removed -alertmanager.storage.* configuration options, with the exception of the CLI flags -alertmanager.storage.path and -alertmanager.storage.retention. Use -alertmanager-storage.* instead. #632
[CHANGE] Alertmanager: set default value for -alertmanager.web.external-url=http://localhost:8080/alertmanager to match the default configuration. #808 #1067
[CHANGE] Alertmanager: -experimental.alertmanager.enable-api flag has been renamed to -alertmanager.enable-api and is now stable. #913
[CHANGE] Alertmanager: now always runs with sharding enabled; other modes of operation are removed. #1044 #1126
- The following configuration options are removed:
  - -alertmanager.sharding-enabled
  - -alertmanager.cluster.advertise-address
  - -alertmanager.cluster.gossip-interval
  - -alertmanager.cluster.listen-address
  - -alertmanager.cluster.peers
  - -alertmanager.cluster.push-pull-interval
- The following configuration options are renamed:
  - -alertmanager.cluster.peer-timeout to -alertmanager.peer-timeout
[CHANGE] Alertmanager: the default value of -alertmanager.sharding-ring.store is now memberlist. #1171
[CHANGE] Ring: changed default value of -distributor.ring.store (Distributor ring) and -ring.store (Ingester ring) to memberlist. #1046
[CHANGE] Memberlist: the memberlist_kv_store_value_bytes metric has been removed due to values no longer being stored in-memory as encoded bytes. #4345
[CHANGE] Memberlist: forward only changes, not entire original message. #4419
[CHANGE] Memberlist: don't accept old tombstones as incoming change, and don't forward such messages to other gossip members. #4420
[CHANGE] Memberlist: changed probe interval from 1s to 5s and probe timeout from 500ms to 2s. #563
[CHANGE] Memberlist: the name label on metrics cortex_dns_failures_total, cortex_dns_lookups_total and cortex_dns_provider_results was renamed to component. #993
[CHANGE] Limits: removed deprecated limits for rejecting old samples #799 This removes the following flags:
- -validation.reject-old-samples
- -validation.reject-old-samples.max-age
[CHANGE] Limits: removed local limit-related flags in favor of global limits. #725 The distributor ring is now required, and can be configured via the distributor.ring.* flags. This removes the following flags:
- -distributor.ingestion-rate-strategy -> will now always use the "global" strategy
- -ingester.max-series-per-user -> set -ingester.max-global-series-per-user to N times the existing value of -ingester.max-series-per-user instead
- -ingester.max-series-per-metric -> set -ingester.max-global-series-per-metric to N times the existing value of -ingester.max-series-per-metric instead
- -ingester.max-metadata-per-user -> set -ingester.max-global-metadata-per-user to N times the existing value of -ingester.max-metadata-per-user instead
- -ingester.max-metadata-per-metric -> set -ingester.max-global-metadata-per-metric to N times the existing value of -ingester.max-metadata-per-metric instead
- In the above notes, N refers to the number of ingester replicas Additionally, default values for the following flags have changed:
- -ingester.max-global-series-per-user from 0 to 150000
- -ingester.max-global-series-per-metric from 0 to 20000
- -distributor.ingestion-rate-limit from 25000 to 10000
- -distributor.ingestion-burst-size from 50000 to 200000
[CHANGE] Limits: removed limit enforce_metric_name, now behave as if set to true always. #686
[CHANGE] Limits: Option -ingester.max-samples-per-query and its YAML field max_samples_per_query have been removed. It required -querier.ingester-streaming option to be set to false, but since -querier.ingester-streaming is removed (always defaulting to true), the limit using it was removed as well. #204 #1132
[CHANGE] Limits: Set the default max number of inflight ingester push requests (-ingester.instance-limits.max-inflight-push-requests) to 30000 in order to prevent clusters from being overwhelmed by request volume or temporary slow-downs. #259
[CHANGE] Overrides exporter: renamed metric cortex_overrides to cortex_limits_overrides. #173 #407
[FEATURE] The following features have been moved from experimental to stable: #913 #1002
- Alertmanager config API
- Alertmanager receiver firewall
- Alertmanager sharding
- Azure blob storage support
- Blocks storage bucket index
- Disable the ring health check in the readiness endpoint (-ingester.readiness-check-ring-health=false)
- Distributor: do not extend writes on unhealthy ingesters
- Do not unregister ingesters from ring on shutdown (-ingester.unregister-on-shutdown=false)
- HA Tracker: cleanup of old replicas from KV Store
- Instance limits in ingester and distributor
- OpenStack Swift storage support
- Query-frontend: query stats tracking
- Query-scheduler
- Querier: tenant federation
- Ruler config API
- S3 Server Side Encryption (SSE) using KMS
- TLS configuration for gRPC, HTTP and etcd clients
- Zone-aware replication
- /labels API using matchers
- The following querier limits:
  - -querier.max-fetched-chunks-per-query
  - -querier.max-fetched-chunk-bytes-per-query
  - -querier.max-fetched-series-per-query
- The following alertmanager limits:
  - Notification rate (-alertmanager.notification-rate-limit and -alertmanager.notification-rate-limit-per-integration)
  - Dispatcher groups (-alertmanager.max-dispatcher-aggregation-groups)
  - User config size (-alertmanager.max-config-size-bytes)
  - Templates count in user config (-alertmanager.max-templates-count)
  - Max template size (-alertmanager.max-template-size-bytes)
[FEATURE] The endpoints /api/v1/status/buildinfo, <prometheus-http-prefix>/api/v1/status/buildinfo, and <alertmanager-http-prefix>/api/v1/status/buildinfo have been added to display build information and enabled features. #1219 #1240
[FEATURE] PromQL: added present_over_time support. #139
[FEATURE] Added "Activity tracker" feature which can log ongoing activities from previous Mimir run in case of a crash. It is enabled by default and controlled by the -activity-tracker.filepath flag. It can be disabled by setting this path to an empty string. Currently, the Store-gateway, Ruler, Querier, Query-frontend and Ingester components use this feature to track queries. #631 #782 #822 #1121
[FEATURE] Divide configuration parameters into categories "basic", "advanced", and "experimental". Only flags in the basic category are shown when invoking -help, whereas -help-all will include flags in all categories (basic, advanced, experimental). #840
[FEATURE] Querier: Added support for tenant federation to exemplar endpoints. #927
[FEATURE] Ingester: can expose metrics on active series matching custom trackers configured via -ingester.active-series-custom-trackers (or its respective YAML config option). When configured, active series for custom trackers are exposed by the cortex_ingester_active_series_custom_tracker metric. #42 #672
[FEATURE] Ingester: Enable snapshotting of in-memory TSDB on disk during shutdown via -blocks-storage.tsdb.memory-snapshot-on-shutdown (experimental). #249
[FEATURE] Ingester: Added -blocks-storage.tsdb.isolation-enabled flag, which allows disabling TSDB isolation feature. This is enabled by default (per TSDB default), but disabling can improve performance of write requests. #512
[FEATURE] Ingester: Added -blocks-storage.tsdb.head-chunks-write-queue-size flag, which allows setting the size of the queue used by the TSDB before m-mapping chunks (experimental). #591
- Added cortex_ingester_tsdb_mmap_chunk_write_queue_operations_total metric to track different operations of this queue.
[FEATURE] Distributor: Added -api.skip-label-name-validation-header-enabled option to allow skipping label name validation on the HTTP write path based on X-Mimir-SkipLabelNameValidation header being true or not. #390
[FEATURE] Query-frontend: Add cortex_query_fetched_series_total and cortex_query_fetched_chunks_bytes_total per-user counters to expose the number of series and bytes fetched as part of queries. These metrics can be enabled with the -frontend.query-stats-enabled flag (or its respective YAML config option query_stats_enabled). #4343
[FEATURE] Query-frontend: Add cortex_query_fetched_chunks_total per-user counter to expose the number of chunks fetched as part of queries. This metric can be enabled with the -query-frontend.query-stats-enabled flag (or its respective YAML config option query_stats_enabled). #31
[FEATURE] Query-frontend: Add query sharding for instant and range queries. You can enable querysharding by setting -query-frontend.parallelize-shardable-queries to true. The following additional config and exported metrics have been added. #79 #80 #100 #124 #140 #148 #150 #151 #153 #154 #155 #156 #157 #158 #159 #160 #163 #169 #172 #196 #205 #225 #226 #227 #228 #230 #235 #240 #239 #246 #244 #319 #330 #371 #385 #400 #458 #586 #630 #660 #707 #1542
- New config options:
  - -query-frontend.query-sharding-total-shards: The amount of shards to use when doing parallelisation via query sharding.
  - -query-frontend.query-sharding-max-sharded-queries: The max number of sharded queries that can be run for a given received query. 0 to disable limit.
  - -blocks-storage.bucket-store.series-hash-cache-max-size-bytes: Max size - in bytes - of the in-memory series hash cache in the store-gateway.
  - -blocks-storage.tsdb.series-hash-cache-max-size-bytes: Max size - in bytes - of the in-memory series hash cache in the ingester.
- New exported metrics:
  - cortex_bucket_store_series_hash_cache_requests_total
  - cortex_bucket_store_series_hash_cache_hits_total
  - cortex_frontend_query_sharding_rewrites_succeeded_total
  - cortex_frontend_sharded_queries_per_query
- Renamed metrics:
  - cortex_frontend_mapped_asts_total to cortex_frontend_query_sharding_rewrites_attempted_total
- Modified metrics:
  - added sharded label to cortex_query_seconds_total
- When query sharding is enabled, the following querier config must be set on query-frontend too:
  - -querier.max-concurrent
  - -querier.timeout
  - -querier.max-samples
  - -querier.at-modifier-enabled
  - -querier.default-evaluation-interval
  - -querier.active-query-tracker-dir
  - -querier.lookback-delta
- Sharding can be dynamically controlled per request using the Sharding-Control: 64 header. (0 to disable)
- Sharding can be dynamically controlled per tenant using the limit query_sharding_total_shards. (0 to disable)
- Added sharded_queries count to the "query stats" log.
- The number of shards is adjusted to be compatible with number of compactor shards that are used by a split-and-merge compactor. The querier can use this to avoid querying blocks that cannot have series in a given query shard.
[FEATURE] Query-Frontend: Added -query-frontend.cache-unaligned-requests option to cache responses for requests that do not have step-aligned start and end times. This can improve speed of repeated queries, but can also pollute cache with results that are never reused. #432
[FEATURE] Querier: Added label names cardinality endpoint <prefix>/api/v1/cardinality/label_names that is disabled by default. Can be enabled/disabled via the CLI flag -querier.cardinality-analysis-enabled or its respective YAML config option. Configurable on a per-tenant basis. #301 #377 #474
[FEATURE] Querier: Added label values cardinality endpoint <prefix>/api/v1/cardinality/label_values that is disabled by default. Can be enabled/disabled via the CLI flag -querier.cardinality-analysis-enabled or its respective YAML config option, and configurable on a per-tenant basis. The maximum number of label names allowed to be queried in a single API call can be controlled via -querier.label-values-max-cardinality-label-names-per-request. #332 #395 #474
[FEATURE] Querier: Added -store.max-labels-query-length to restrict the range of /series, label-names and label-values requests. #507
[FEATURE] Ruler: Add new -ruler.query-stats-enabled which when enabled will report the cortex_ruler_query_seconds_total as a per-user metric that tracks the sum of the wall time of executing queries in the ruler in seconds. #4317
[FEATURE] Ruler: Added federated rule groups. #533
- Added -ruler.tenant-federation.enabled config flag.
- Added support for source_tenants field on rule groups.
[FEATURE] Store-gateway: Added /store-gateway/tenants and /store-gateway/tenant/{tenant}/blocks endpoints that provide functionality that was provided by tools/listblocks. #911 #973
[FEATURE] Compactor: compactor now uses new algorithm that we call "split-and-merge". Previous compaction strategy was removed. With the split-and-merge compactor source blocks for a given tenant are grouped into -compactor.split-groups number of groups. Each group of blocks is then compacted separately, and is split into -compactor.split-and-merge-shards shards (configurable on a per-tenant basis). Compaction of each tenant shards can be horizontally scaled. Number of compactors that work on jobs for single tenant can be limited by using -compactor.compactor-tenant-shard-size parameter, or per-tenant compactor_tenant_shard_size override. #275 #281 #282 #283 #288 #290 #303 #307 #317 #323 #324 #328 #353 #368 #479 #820
[FEATURE] Compactor: Added -compactor.max-compaction-time to control how long can compaction for a single tenant take. If compactions for a tenant take longer, no new compactions are started in the same compaction cycle. Running compactions are not stopped however, and may take much longer. #523
[FEATURE] Compactor: When compactor finds blocks with out-of-order chunks, it will mark them for no-compaction. Blocks marked for no-compaction are ignored in future compactions too. Added metric cortex_compactor_blocks_marked_for_no_compaction_total to track number of blocks marked for no-compaction. Added CortexCompactorSkippedBlocksWithOutOfOrderChunks alert based on new metric. Markers are only checked from <tenant>/markers location, but uploaded to the block directory too. #520 #535 #550
[FEATURE] Compactor: multiple blocks are now downloaded and uploaded at once, which can shorten compaction process. #552
[ENHANCEMENT] Exemplars are now emitted for all gRPC calls and many operations tracked by histograms. #180
[ENHANCEMENT] New options -server.http-listen-network and -server.grpc-listen-network allow binding as 'tcp4' or 'tcp6'. #180
[ENHANCEMENT] Query federation: improve performance in MergeQueryable by memoizing labels. #312
[ENHANCEMENT] Add histogram metrics cortex_distributor_sample_delay_seconds and cortex_ingester_tsdb_sample_out_of_order_delta_seconds #488
[ENHANCEMENT] Check internal directory access before starting up. #1217
[ENHANCEMENT] Azure client: expose option to configure MSI URL and user-assigned identity. #584
[ENHANCEMENT] Added a new metric mimir_build_info to coincide with cortex_build_info. The metric cortex_build_info has not been removed. #1022
[ENHANCEMENT] Mimir runs a sanity check of storage config at startup and will fail to start if the sanity check doesn't pass. This is done to find potential config issues before starting up. #1180
[ENHANCEMENT] Validate alertmanager and ruler storage configurations to ensure they don't use same bucket name and region values as those configured for the blocks storage. #1214
[ENHANCEMENT] Ingester: added option -ingester.readiness-check-ring-health to disable the ring health check in the readiness endpoint. When disabled, the health checks are run against only the ingester itself instead of all ingesters in the ring. #48 #126
[ENHANCEMENT] Ingester: reduce CPU and memory utilization if remote write requests contains a large amount of "out of bounds" samples. #413
[ENHANCEMENT] Ingester: reduce CPU and memory utilization when querying chunks from ingesters. #430
[ENHANCEMENT] Ingester: Expose ingester ring page on ingesters. #654
[ENHANCEMENT] Distributor: added option -distributor.excluded-zones to exclude ingesters running in specific zones both on write and read path. #51
[ENHANCEMENT] Distributor: add tags to tracing span for distributor push with user, cluster and replica. #210
[ENHANCEMENT] Distributor: performance optimisations. #212 #217 #242
[ENHANCEMENT] Distributor: reduce latency when HA-Tracking by doing KVStore updates in the background. #271
[ENHANCEMENT] Distributor: make distributor inflight push requests count include background calls to ingester. #398
[ENHANCEMENT] Distributor: silently drop exemplars more than 5 minutes older than samples in the same batch. #544
[ENHANCEMENT] Distributor: reject exemplars with blank label names or values. The cortex_discarded_exemplars_total metric will use the exemplar_labels_blank reason in this case. #873
[ENHANCEMENT] Query-frontend: added cortex_query_frontend_workers_enqueued_requests_total metric to track the number of requests enqueued in each query-scheduler. #384
[ENHANCEMENT] Query-frontend: added cortex_query_frontend_non_step_aligned_queries_total to track the total number of range queries with start/end not aligned to step. #347 #357 #582
[ENHANCEMENT] Query-scheduler: exported summary cortex_query_scheduler_inflight_requests tracking total number of inflight requests (both enqueued and processing) in percentile buckets. #675
[ENHANCEMENT] Querier: can use the LabelNames call with matchers, if matchers are provided in the /labels API call, instead of using the more expensive MetricsForLabelMatchers call as before. #3 #1186
[ENHANCEMENT] Querier / store-gateway: optimized regex matchers. #319 #334 #355
[ENHANCEMENT] Querier: when fetching data for specific query-shard, we can ignore some blocks based on compactor-shard ID, since sharding of series by query sharding and compactor is the same. Added metrics: #438 #450
- cortex_querier_blocks_found_total
- cortex_querier_blocks_queried_total
- cortex_querier_blocks_with_compactor_shard_but_incompatible_query_shard_total
[ENHANCEMENT] Querier / ruler: reduce cpu usage, latency and peak memory consumption. #459 #463 #589
[ENHANCEMENT] Querier: labels requests now obey -querier.query-ingesters-within, making them a little more efficient. #518
[ENHANCEMENT] Querier: retry store-gateway in case of unexpected failure, instead of failing the query. #1003
[ENHANCEMENT] Querier / ruler: reduce memory used by streaming queries, particularly in ruler. #4341
[ENHANCEMENT] Ruler: Using shuffle sharding subring on GetRules API. #4466
[ENHANCEMENT] Ruler: wait for ruler ring client to self-detect during startup. #990
[ENHANCEMENT] Store-gateway: added cortex_bucket_store_sent_chunk_size_bytes metric, tracking the size of chunks sent from store-gateway to querier. #123
[ENHANCEMENT] Store-gateway: reduced CPU and memory utilization due to exported metrics aggregation for instances with a large number of tenants. #123 #142
[ENHANCEMENT] Store-gateway: added an in-memory LRU cache for chunks attributes. Can be enabled setting -blocks-storage.bucket-store.chunks-cache.attributes-in-memory-max-items=X where X is the max number of items to keep in the in-memory cache. The following new metrics are exposed: #279 #415 #437
- cortex_cache_memory_requests_total
- cortex_cache_memory_hits_total
- cortex_cache_memory_items_count
[ENHANCEMENT] Store-gateway: log index cache requests to tracing spans. #419
[ENHANCEMENT] Store-gateway: store-gateway can now ignore blocks with minimum time within -blocks-storage.bucket-store.ignore-blocks-within duration. Useful when used together with -querier.query-store-after. #502
[ENHANCEMENT] Store-gateway: label values with matchers now doesn't preload or list series, reducing latency and memory consumption. #534
[ENHANCEMENT] Store-gateway: the results of LabelNames(), LabelValues() and Series(skipChunks=true) calls are now cached in the index cache. #590
[ENHANCEMENT] Store-gateway: Added -store-gateway.sharding-ring.unregister-on-shutdown option that allows store-gateway to stay in the ring even after shutdown. Defaults to true, which is the same as current behaviour. #610 #614
[ENHANCEMENT] Store-gateway: wait for ring tokens stability instead of ring stability to speed up startup and tests. #620
[ENHANCEMENT] Compactor: add timeout for waiting on compactor to become ACTIVE in the ring. #4262
[ENHANCEMENT] Compactor: skip already planned compaction jobs if the tenant doesn't belong to the compactor instance anymore. #303
[ENHANCEMENT] Compactor: Blocks cleaner will ignore users that it no longer "owns" when sharding is enabled, and user ownership has changed since last scan. #325
[ENHANCEMENT] Compactor: added -compactor.compaction-jobs-order support to configure which compaction jobs should run first for a given tenant (in case there are multiple ones). Supported values are: smallest-range-oldest-blocks-first (default), newest-blocks-first. #364
[ENHANCEMENT] Compactor: delete blocks marked for deletion faster. #490
[ENHANCEMENT] Compactor: expose low-level concurrency options for compactor: -compactor.max-opening-blocks-concurrency, -compactor.max-closing-blocks-concurrency, -compactor.symbols-flushers-concurrency. #569 #701
[ENHANCEMENT] Compactor: expand compactor logs to include total compaction job time, total time for uploads and block counts. #549
[ENHANCEMENT] Ring: allow experimental configuration of disabling of heartbeat timeouts by setting the relevant configuration value to zero. Applies to the following: #4342
- -distributor.ring.heartbeat-timeout
- -ingester.ring.heartbeat-timeout
- -ruler.ring.heartbeat-timeout
- -alertmanager.sharding-ring.heartbeat-timeout
- -compactor.ring.heartbeat-timeout
- -store-gateway.sharding-ring.heartbeat-timeout
[ENHANCEMENT] Ring: allow heartbeats to be explicitly disabled by setting the interval to zero. This is considered experimental. This applies to the following configuration options: #4344
- -distributor.ring.heartbeat-period
- -ingester.ring.heartbeat-period
- -ruler.ring.heartbeat-period
- -alertmanager.sharding-ring.heartbeat-period
- -compactor.ring.heartbeat-period
- -store-gateway.sharding-ring.heartbeat-period
[ENHANCEMENT] Memberlist: optimized receive path for processing ring state updates, to help reduce CPU utilization in large clusters. #4345
[ENHANCEMENT] Memberlist: expose configuration of memberlist packet compression via -memberlist.compression-enabled. #4346
[ENHANCEMENT] Memberlist: Add -memberlist.advertise-addr and -memberlist.advertise-port options for setting the address to advertise to other members of the cluster to enable NAT traversal. #260
[ENHANCEMENT] Memberlist: reduce CPU utilization for rings with a large number of members. #537 #563 #634
[ENHANCEMENT] Overrides exporter: include additional limits in the per-tenant override exporter. The following limits have been added to the cortex_limit_overrides metric: #21
- max_fetched_series_per_query
- max_fetched_chunk_bytes_per_query
- ruler_max_rules_per_rule_group
- ruler_max_rule_groups_per_tenant
[ENHANCEMENT] Overrides exporter: add a metrics cortex_limits_defaults to expose the default values of limits. #173
[ENHANCEMENT] Overrides exporter: Add max_fetched_chunks_per_query and max_global_exemplars_per_user limits to the default and per-tenant limits exported as metrics. #471 #515
[ENHANCEMENT] Upgrade Go to 1.17.8. #1347 #1381
[ENHANCEMENT] Upgrade Docker base images to alpine:3.15.0. #1348
[BUGFIX] Azure storage: only create HTTP client once, to reduce memory utilization. #605
[BUGFIX] Ingester: fixed ingester stuck on start up (LEAVING ring state) when -ingester.ring.heartbeat-period=0 and -ingester.unregister-on-shutdown=false. #4366
[BUGFIX] Ingester: prevent any reads or writes while the ingester is stopping. This will prevent accessing TSDB blocks once they have been already closed. #4304
[BUGFIX] Ingester: TSDB now waits for pending readers before truncating Head block, fixing the chunk not found error and preventing wrong query results. #16
[BUGFIX] Ingester: don't create TSDB or appender if no samples are sent by a tenant. #162
[BUGFIX] Ingester: fix out-of-order chunks in TSDB head in-memory series after WAL replay in case some samples were appended to TSDB WAL before series. #530
[BUGFIX] Distributor: when cleaning up obsolete elected replicas from KV store, HA tracker didn't update number of cluster per user correctly. #4336
[BUGFIX] Distributor: fix bug in query-exemplar where some results would get dropped. #583
[BUGFIX] Query-frontend: Fixes @ modifier functions (start/end) when splitting queries by time. #206
[BUGFIX] Query-frontend: Ensure query_range requests handled by the query-frontend return JSON formatted errors. #360 #499
[BUGFIX] Query-frontend: don't reuse cached results for queries that are not step-aligned. #424
[BUGFIX] Query-frontend: fix API error messages that were mentioning Prometheus --enable-feature=promql-negative-offset and --enable-feature=promql-at-modifier flags. #688
[BUGFIX] Query-frontend: worker's cancellation channels are now buffered to ensure that all request cancellations are properly handled. #741
[BUGFIX] Querier: fixed /api/v1/user_stats endpoint. When zone-aware replication is enabled, MaxUnavailableZones param is used instead of MaxErrors, so setting MaxErrors = 0 doesn't make the Querier wait for all Ingesters responses. #474
[BUGFIX] Querier: Disable query scheduler SRV DNS lookup. #689
[BUGFIX] Ruler: fixed counting of PromQL evaluation errors as user-errors when updating cortex_ruler_queries_failed_total. #4335
[BUGFIX] Ruler: fix formatting of rule groups in /ruler/rule_groups endpoint. #655
[BUGFIX] Ruler: do not log unable to read rules directory at startup if the directory hasn't been created yet. #1058
[BUGFIX] Ruler: enable Prometheus-compatible endpoints regardless of -ruler.enable-api. The flag now only controls the configuration API. This is what the config flag description stated, but not what was happening. #1216
[BUGFIX] Compactor: fixed panic while collecting Prometheus metrics. #28
[BUGFIX] Compactor: compactor should now be able to correctly mark blocks for deletion and no-compaction, if such marking was previously interrupted. #1015
[BUGFIX] Alertmanager: remove stale template files. #4495
[BUGFIX] Alertmanager: don't replace user configurations with blank fallback configurations (when enabled), particularly during scaling up/down instances when sharding is enabled. #224
[BUGFIX] Ring: multi KV runtime config changes are now propagated to all rings, not just ingester ring. #1047
[BUGFIX] Memberlist: fixed corrupted packets when sending compound messages with more than 255 messages or messages bigger than 64KB. #551
[BUGFIX] Overrides exporter: successfully startup even if runtime config is not set. #1056
[BUGFIX] Fix internal modules to wait for other modules depending on them before stopping. #1472

Mixin

Changes since grafana/cortex-jsonnet 1.9.0.

[CHANGE] Removed chunks storage support from mixin. #641 #643 #645 #811 #812 #813
- Removed tsdb.libsonnet: no need to import it anymore (its content is already automatically included when using Jsonnet)
- Removed the following fields from _config:
  - storage_engine (defaults to blocks)
  - chunk_index_backend
  - chunk_store_backend
- Removed schema config map
- Removed the following dashboards:
  - "Cortex / Chunks"
  - "Cortex / WAL"
  - "Cortex / Blocks vs Chunks"
- Removed the following alerts:
  - CortexOldChunkInMemory
  - CortexCheckpointCreationFailed
  - CortexCheckpointDeletionFailed
  - CortexProvisioningMemcachedTooSmall
  - CortexWALCorruption
  - CortexTableSyncFailure
  - CortexTransferFailed
- Removed the following recording rules:
  - cortex_chunk_store_index_lookups_per_query
  - cortex_chunk_store_series_pre_intersection_per_query
  - cortex_chunk_store_series_post_intersection_per_query
  - cortex_chunk_store_chunks_per_query
  - cortex_bigtable_request_duration_seconds
  - cortex_cassandra_request_duration_seconds
  - cortex_dynamo_request_duration_seconds
  - cortex_database_request_duration_seconds
  - cortex_gcs_request_duration_seconds
[CHANGE] Update grafana-builder dependency: use $__rate_interval in qpsPanel and latencyPanel. #372
[CHANGE] namespace template variable in dashboards now only selects namespaces for selected clusters. #311
[CHANGE] CortexIngesterRestarts alert severity changed from critical to warning. #321
[CHANGE] Dashboards: added overridable job_labels and cluster_labels to the configuration object as label lists to uniquely identify jobs and clusters in the metric names and group-by lists in dashboards. #319
[CHANGE] Dashboards: alert_aggregation_labels has been removed from the configuration and overriding this value has been deprecated. Instead the labels are now defined by the cluster_labels list, and should be overridden accordingly through that list. #319
[CHANGE] Renamed CortexCompactorHasNotUploadedBlocksSinceStart to CortexCompactorHasNotUploadedBlocks. #334
[CHANGE] Renamed CortexCompactorRunFailed to CortexCompactorHasNotSuccessfullyRunCompaction. #334
[CHANGE] Renamed CortexInconsistentConfig alert to CortexInconsistentRuntimeConfig and increased severity to critical. #335
[CHANGE] Increased CortexBadRuntimeConfig alert severity to critical and removed support for cortex_overrides_last_reload_successful metric (was removed in Cortex 1.3.0). #335
[CHANGE] Grafana 'min step' changed to 15s so dashboard show better detail. #340
[CHANGE] Replace CortexRulerFailedEvaluations with two new alerts: CortexRulerTooManyFailedPushes and CortexRulerTooManyFailedQueries. #347
[CHANGE] Removed CortexCacheRequestErrors alert. This alert was not working because the legacy Cortex cache client instrumentation doesn't track errors. #346
[CHANGE] Removed CortexQuerierCapacityFull alert. #342
[CHANGE] Changes blocks storage alerts to group metrics by the configured cluster_labels (supporting the deprecated alert_aggregation_labels). #351
[CHANGE] Increased CortexIngesterReachingSeriesLimit critical alert threshold from 80% to 85%. #363
[CHANGE] Changed default job_names for query-frontend, query-scheduler and querier to match custom deployments too. #376
[CHANGE] Split cortex_api recording rule group into three groups. This is a workaround for large clusters where this group can become slow to evaluate. #401
[CHANGE] Increased CortexIngesterReachingSeriesLimit warning threshold from 70% to 80% and critical threshold from 85% to 90%. #404
[CHANGE] Raised CortexKVStoreFailure alert severity from warning to critical. #493
[CHANGE] Increase CortexRolloutStuck alert "for" duration from 15m to 30m. #493 #573
[CHANGE] The Alertmanager and Ruler compiled dashboards (alertmanager.json and ruler.json) have been respectively renamed to mimir-alertmanager.json and mimir-ruler.json. #869
[CHANGE] Removed cortex_overrides_metric from _config. #871
[CHANGE] Renamed recording rule groups (cortex_ prefix changed to mimir_). #871
[CHANGE] Alerts name prefix has been changed from Cortex to Mimir (eg. alert CortexIngesterUnhealthy has been renamed to MimirIngesterUnhealthy). #879
[CHANGE] Enabled resources dashboards by default. Can be disabled setting resources_dashboards_enabled config field to false. #920
[FEATURE] Added Cortex / Overrides dashboard, displaying default limits and per-tenant overrides applied to Mimir. #673
[FEATURE] Added Mimir / Tenants and Mimir / Top tenants dashboards, displaying user-based metrics. #776
[FEATURE] Added querier autoscaling panels and alerts. #1006 #1016
[FEATURE] Mimir / Top tenants dashboard now has tenants ranked by rule group size and evaluation time. #1338
[ENHANCEMENT] cortex-mixin: Make cluster_namespace_deployment:kube_pod_container_resource_requests_{cpu_cores,memory_bytes}:sum backwards compatible with kube-state-metrics v2.0.0. #317
[ENHANCEMENT] Cortex-mixin: Include cortex-gw-internal naming variation in default gateway job names. #328
[ENHANCEMENT] Ruler dashboard: added object storage metrics. #354
[ENHANCEMENT] Alertmanager dashboard: added object storage metrics. #354
[ENHANCEMENT] Added documentation text panels and descriptions to reads and writes dashboards. #324
[ENHANCEMENT] Dashboards: defined container functions for common resources panels: containerDiskWritesPanel, containerDiskReadsPanel, containerDiskSpaceUtilization. #331
[ENHANCEMENT] cortex-mixin: Added alert_excluded_routes config to exclude specific routes from alerts. #338
[ENHANCEMENT] Added CortexMemcachedRequestErrors alert. #346
[ENHANCEMENT] Ruler dashboard: added "Per route p99 latency" panel in the "Configuration API" row. #353
[ENHANCEMENT] Increased the for duration of the CortexIngesterReachingSeriesLimit warning alert to 3h. #362
[ENHANCEMENT] Added a new tier (medium_small_user) so we have another tier between 100K and 1Mil active series. #364
[ENHANCEMENT] Extend Alertmanager dashboard: #313
- "Tenants" stat panel - shows number of discovered tenant configurations.
- "Replication" row - information about the replication of tenants/alerts/silences over instances.
- "Tenant Configuration Sync" row - information about the configuration sync procedure.
- "Sharding Initial State Sync" row - information about the initial state sync procedure when sharding is enabled.
- "Sharding Runtime State Sync" row - information about various state operations which occur when sharding is enabled (replication, fetch, marge, persist).
[ENHANCEMENT] Update gsutil command for not healthy index found playbook #370
[ENHANCEMENT] Added Alertmanager alerts and playbooks covering configuration syncs and sharding operation: [#377 #378
- CortexAlertmanagerSyncConfigsFailing
- CortexAlertmanagerRingCheckFailing
- CortexAlertmanagerPartialStateMergeFailing
- CortexAlertmanagerReplicationFailing
- CortexAlertmanagerPersistStateFailing
- CortexAlertmanagerInitialSyncFailed
[ENHANCEMENT] Add recording rules to improve responsiveness of Alertmanager dashboard. #387
[ENHANCEMENT] Add CortexRolloutStuck alert. #405
[ENHANCEMENT] Added CortexKVStoreFailure alert. #406
[ENHANCEMENT] Use configured ruler jobname for ruler dashboard panels. #409
[ENHANCEMENT] Add ability to override datasource for generated dashboards. #407
[ENHANCEMENT] Use alertmanager jobname for alertmanager dashboard panels #411
[ENHANCEMENT] Added CortexDistributorReachingInflightPushRequestLimit alert. #408
[ENHANCEMENT] Added CortexReachingTCPConnectionsLimit alert. #403
[ENHANCEMENT] Added "Cortex / Writes Networking" and "Cortex / Reads Networking" dashboards. #405
[ENHANCEMENT] Improved "Queue length" panel in "Cortex / Queries" dashboard. #408
[ENHANCEMENT] Add CortexDistributorReachingInflightPushRequestLimit alert and playbook. #401
[ENHANCEMENT] Added "Recover accidentally deleted blocks (Google Cloud specific)" playbook. #475
[ENHANCEMENT] Added support to multi-zone store-gateway deployments. #608 #615
[ENHANCEMENT] Show supplementary alertmanager services in the Rollout Progress dashboard. #738 #855
[ENHANCEMENT] Added mimir to default job names. This makes dashboards and alerts working when Mimir is installed in single-binary mode and the deployment is named mimir. #921
[ENHANCEMENT] Introduced a new alert for the Alertmanager: MimirAlertmanagerAllocatingTooMuchMemory. It has two severities based on the memory usage against limits, a warning level at 80% and a critical level at 90%. #1206
[ENHANCEMENT] Faster memcached cache requests. #2720
[BUGFIX] Fixed CortexIngesterHasNotShippedBlocks alert false positive in case an ingester instance had ingested samples in the past, then no traffic was received for a long period and then it started receiving samples again. #308
[BUGFIX] Fixed CortexInconsistentRuntimeConfig metric. #335
[BUGFIX] Fixed scaling dashboard to correctly work when a Cortex service deployment spans across multiple zones (a zone is expected to have the zone-[a-z] suffix). #365
[BUGFIX] Fixed rollout progress dashboard to correctly work when a Cortex service deployment spans across multiple zones (a zone is expected to have the zone-[a-z] suffix). #366
[BUGFIX] Fixed rollout progress dashboard to include query-scheduler too. #376
[BUGFIX] Upstream recording rule node_namespace_pod_container:container_cpu_usage_seconds_total:sum_irate renamed. #379
[BUGFIX] Fixed writes/reads/alertmanager resources dashboards to use $._config.job_names.gateway. #403
[BUGFIX] Span the annotation.message in alerts as YAML multiline strings. #412
[BUGFIX] Fixed "Instant queries / sec" in "Cortex / Reads" dashboard. #445
[BUGFIX] Fixed and added missing KV store panels in Writes, Reads, Ruler and Compactor dashboards. #448
[BUGFIX] Fixed Alertmanager dashboard when alertmanager is running as part of single binary. #1064
[BUGFIX] Fixed Ruler dashboard when ruler is running as part of single binary. #1260
[BUGFIX] Query-frontend: fixed bad querier status code mapping with query-sharding enabled. #1227

Jsonnet

Changes since grafana/cortex-jsonnet 1.9.0.

[CHANGE] Removed chunks storage support. #639
- Removed the following fields from _config:
  - storage_engine (defaults to blocks)
  - querier_second_storage_engine (not supported anymore)
  - table_manager_enabled, table_prefix
  - memcached_index_writes_enabled and memcached_index_writes_max_item_size_mb
  - storeMemcachedChunksConfig
  - storeConfig
  - max_chunk_idle
  - schema (the schema configmap is still added for backward compatibility reasons)
  - bigtable_instance and bigtable_project
  - client_configs
  - enabledBackends
  - storage_backend
  - cassandra_addresses
  - s3_bucket_name
  - ingester_deployment_without_wal (was only used by chunks storage)
  - ingester (was only used to configure chunks storage WAL)
- Removed the following CLI flags from ingester_args:
  - ingester.max-chunk-age
  - ingester.max-stale-chunk-idle
  - ingester.max-transfer-retries
  - ingester.retain-period
[CHANGE] Changed overrides-exporter.libsonnet from being based on cortex-tools to Mimir overrides-exporter target. #646
[CHANGE] Store gateway: set -blocks-storage.bucket-store.index-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.chunks-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.metadata-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.index-cache.memcached.max-idle-connections, -blocks-storage.bucket-store.chunks-cache.memcached.max-idle-connections, -blocks-storage.bucket-store.metadata-cache.memcached.max-idle-connections to 100 #414
[CHANGE] Alertmanager: mounted overrides configmap to alertmanager too. #315
[CHANGE] Memcached: upgraded memcached from 1.5.17 to 1.6.9. #316
[CHANGE] Store-gateway: increased memory request and limit respectively from 6GB / 6GB to 12GB / 18GB. #322
[CHANGE] Store-gateway: increased -blocks-storage.bucket-store.max-chunk-pool-bytes from 2GB (default) to 12GB. #322
[CHANGE] Ingester/Ruler: set -server.grpc-max-send-msg-size-bytes and -server.grpc-max-send-msg-size-bytes to sensible default values (10MB). #326
[CHANGE] Decreased -server.grpc-max-concurrent-streams from 100k to 10k. #369
[CHANGE] Decreased blocks storage ingesters graceful termination period from 80m to 20m. #369
[CHANGE] Increase the rules per group and rule groups limits on different tiers. #396
[CHANGE] Removed max_samples_per_query limit, since it only works with chunks and only when using -distributor.shard-by-all-labels=false. #397
[CHANGE] Removed chunks storage query sharding config support. The following config options have been removed: #398
- _config > queryFrontend > shard_factor
- _config > queryFrontend > sharded_queries_enabled
- _config > queryFrontend > query_split_factor
[CHANGE] Rename ruler_s3_bucket_name and ruler_gcs_bucket_name to ruler_storage_bucket_name: #415
[CHANGE] Fine-tuned rolling update policy for distributor, querier, query-frontend, query-scheduler. #420
[CHANGE] Increased memcached metadata/chunks/index-queries max connections from 4k to 16k. #420
[CHANGE] Disabled step alignment in query-frontend to be compliant with PromQL. #420
[CHANGE] Do not limit compactor CPU and request a number of cores equal to the configured concurrency. #420
[CHANGE] Configured split-and-merge compactor. #853
- The following CLI flags are set on compactor:
  - -compactor.split-and-merge-shards=0
  - -compactor.compactor-tenant-shard-size=1
  - -compactor.split-groups=1
  - -compactor.max-opening-blocks-concurrency=4
  - -compactor.max-closing-blocks-concurrency=2
  - -compactor.symbols-flushers-concurrency=4
- The following per-tenant overrides have been set on super_user and mega_user classes:
```
compactor_split_and_merge_shards: 2,
compactor_tenant_shard_size: 2,
compactor_split_groups: 2,
```
[CHANGE] The entrypoint file to include has been renamed from cortex.libsonnet to mimir.libsonnet. #897
[CHANGE] The default image config field has been renamed from cortex to mimir. #896
```
{
  _images+:: {
    mimir: '...',
  },
}
```
[CHANGE] Removed cortex_ prefix from config fields. #898
- The following config fields have been renamed:
  - cortex_bucket_index_enabled renamed to bucket_index_enabled
  - cortex_compactor_cleanup_interval renamed to compactor_cleanup_interval
  - cortex_compactor_data_disk_class renamed to compactor_data_disk_class
  - cortex_compactor_data_disk_size renamed to compactor_data_disk_size
  - cortex_compactor_max_concurrency renamed to compactor_max_concurrency
  - cortex_distributor_allow_multiple_replicas_on_same_node renamed to distributor_allow_multiple_replicas_on_same_node
  - cortex_ingester_data_disk_class renamed to ingester_data_disk_class
  - cortex_ingester_data_disk_size renamed to ingester_data_disk_size
  - cortex_querier_allow_multiple_replicas_on_same_node renamed to querier_allow_multiple_replicas_on_same_node
  - cortex_query_frontend_allow_multiple_replicas_on_same_node renamed to query_frontend_allow_multiple_replicas_on_same_node
  - cortex_query_sharding_enabled renamed to query_sharding_enabled
  - cortex_query_sharding_msg_size_factor renamed to query_sharding_msg_size_factor
  - cortex_ruler_allow_multiple_replicas_on_same_node renamed to ruler_allow_multiple_replicas_on_same_node
  - cortex_store_gateway_data_disk_class renamed to store_gateway_data_disk_class
  - cortex_store_gateway_data_disk_size renamed to store_gateway_data_disk_size
[CHANGE] The overrides configmap default mountpoint has changed from /etc/cortex to /etc/mimir. It can be customized via the overrides_configmap_mountpoint config field. #899
[CHANGE] Enabled in the querier the features to query label names with matchers, PromQL at modifier and query long-term storage for labels. #905
[CHANGE] Reduced TSDB blocks retention on ingesters disk from 96h to 24h. #905
[CHANGE] Enabled closing of idle TSDB in ingesters. #905
[CHANGE] Disabled TSDB isolation in ingesters for better performances. #905
[CHANGE] Changed log level of querier, query-frontend, query-scheduler and alertmanager from debug to info. #905
[CHANGE] Enabled attributes in-memory cache in store-gateway. #905
[CHANGE] Configured store-gateway to not load blocks containing samples more recent than 10h (because such samples are queried from ingesters). #905
[CHANGE] Dynamically compute -compactor.deletion-delay based on other settings, in order to reduce the deletion delay as much as possible and lower the number of live blocks in the storage. #907
[CHANGE] The config field distributorConfig has been renamed to ingesterRingClientConfig. Config field ringClient has been removed in favor of ingesterRingClientConfig. #997 #1057
[CHANGE] Gossip.libsonnet has been fixed to modify all ring configurations, not only the ingester ring config. Furthermore it now supports migration via multi KV store. #1057 #1099
[CHANGE] Changed the default of bucket_index_enabled to true. #924
[CHANGE] Remove the support for the test-exporter. #1133
[CHANGE] Removed $.distributor_deployment_labels, $.ingester_deployment_labels and $.querier_deployment_labels fields, that were used by gossip.libsonnet to inject additional label. Now the label is injected directly into pods of statefulsets and deployments. #1297
[CHANGE] Disabled -ingester.readiness-check-ring-health. #1352
[CHANGE] Changed Alertmanager CPU request from 100m to 2 cores, and memory request from 1Gi to 10Gi. Set Alertmanager memory limit to 15Gi. #1206
[CHANGE] gossip.libsonnet has been renamed to memberlist.libsonnet, and is now imported by default. Use of memberlist for ring is enabled by setting _config.memberlist_ring_enabled to true. #1526
[FEATURE] Added query sharding support. It can be enabled setting cortex_query_sharding_enabled: true in the _config object. #653

[FEATURE] Added shuffle-sharding support. It can be enabled and configured using the following config: #902

_config+:: {
  shuffle_sharding:: {
    ingester_write_path_enabled: true,
    ingester_read_path_enabled: true,
    querier_enabled: true,
    ruler_enabled: true,
    store_gateway_enabled: true,
  },
}

[FEATURE] Added multi-zone ingesters and store-gateways support. #1352 #1552
[ENHANCEMENT] Add overrides config to compactor. This allows setting retention configs per user. #386
[ENHANCEMENT] Added 256MB memory ballast to querier. #369
[ENHANCEMENT] Update etcd-operator to latest version (see grafana/jsonnet-libs#480). #263
[ENHANCEMENT] Add support for Azure storage in Alertmanager configuration. #381
[ENHANCEMENT] Add support for running Alertmanager in sharding mode. #394
[ENHANCEMENT] Allow to customize PromQL engine settings via queryEngineConfig. #399
[ENHANCEMENT] Define Azure object storage ruler args. #416
[ENHANCEMENT] Added the following config options to allow to schedule multiple replicas of the same service on the same node: #418
- cortex_distributor_allow_multiple_replicas_on_same_node
- cortex_ruler_allow_multiple_replicas_on_same_node
- cortex_querier_allow_multiple_replicas_on_same_node
- cortex_query_frontend_allow_multiple_replicas_on_same_node
[BUGFIX] Alertmanager: fixed --alertmanager.cluster.peers CLI flag passed to alertmanager when HA is enabled. #329
[BUGFIX] Fixed -distributor.extend-writes setting on ruler when unregister_ingesters_on_shutdown is disabled. #369
[BUGFIX] Treat compactor_blocks_retention_period type as string rather than int.#395
[BUGFIX] Pass -ruler-storage.s3.endpoint to ruler when using S3. #421
[BUGFIX] Remove service selector on label gossip_ring_member from other services than gossip-ring. #1008
[BUGFIX] Rename -ingester.readiness-check-ring-health to -ingester.ring.readiness-check-ring-health, to reflect current name of flag. #1460