Release note for 2024-01-08

CHANGELOG.md

@@ -1,5 +1,37 @@
 # Azure Kubernetes Service Changelog
 
+## Release 2024-01-08
+
+Monitor the release status by regions at [AKS-Release-Tracker](https://releases.aks.azure.com/).
+
+### Announcements
+
+* [CIS Kubernetes V1.27 Benchmark](https://learn.microsoft.com/azure/aks/cis-kubernetes) is published which covers AKS 1.21.x through AKS 1.27.x.
+* Kubernetes 1.25 is being deprecated on January 14, 2024 and support will transition to our [platform support policy](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#platform-support-policy). Please upgrade to Kubernetes version 1.26 or above.
+* Starting January 2024, due to Gatekeeper Upstream removing validation for constraint template contents at create/update time, [the Azure Policy Add-On](https://learn.microsoft.com/azure/governance/policy/concepts/policy-for-kubernetes#install-azure-policy-add-on-for-aks:~:text=exception%20YAML.-,Install%20Azure%20Policy%20Add%2Don%20for%20AKS,-Before%20you%20install) will now no longer support the validation for constraint template. The Azure Policy Add-On will report [‘InvalidConstraint/Template’ compliance reason code](https://learn.microsoft.com/azure/governance/policy/how-to/determine-non-compliance#aks-resource-provider-mode-compliance-reasons) for detected errors after constraint template admission. This change does not impact [other compliance reason codes](https://learn.microsoft.com/azure/governance/policy/how-to/determine-non-compliance#aks-resource-provider-mode-compliance-reasons). Customers are encouraged to continue to follow best practices when updating Azure Policy for Kubernetes definitions (i.e. [Gator CLI](https://open-policy-agent.github.io/gatekeeper/website/docs/gator/).
+* Starting with Kubernetes 1.29, the default cgroups implementation on Azure Linux AKS nodes will be cgroupsv2. Older versions of Java, .NET and NodeJS do not support memory querying v2 memory constraints and this will lead to out of memory (OOM) issues for workloads. Please test your applications for cgroupsv2 compliance, and read the [FAQ](https://learn.microsoft.com/troubleshoot/azure/azure-kubernetes/aks-increased-memory-usage-cgroup-v2) for cgroupsv2.
+* Changes to reduce the kube-reserved memory reservation and eviction threshold will not be available in 1.28 as previously shared due to a release issue. These optimizations will be releasing with AKS Kubernetes minor version 1.29, which previews in January 2024. See [release calendar](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#aks-kubernetes-release-calendar:~:text=patched%20and%20supported.-,AKS%20Kubernetes%20release%20calendar,-View%20the%20upcoming).
+
+### Release notes
+
+* Bug Fixes 
+  * PUT managedCluster operations on API versions that didn't support serviceMeshProfile resulted in "invalid mode" error response to the API requests. This issue has now been fixed.
+  * A wrong MCR URL for [KEDA](https://learn.microsoft.com/azure/aks/keda-about) image in Air Gapped Cloud was previously used resulting in potential failures in enabling the KEDA addon. This issue has now been fixed.
+
+* Behavioral Change
+  *  [Artifact Streaming](https://learn.microsoft.com/azure/aks/artifact-streaming) can now be enabled on an existing node pool.
+  * Starting with the `2024-01-01` and `2024-01-02-preview` APIs, we will begin to reject unknown fields in the request payloads.
+  * The memory limit for [Azure Key Vault provider for Secrets Store CSI Driver](https://learn.microsoft.com/azure/aks/csi-secrets-store-driver) is now increased from 200 Mi to 300Mi.
+  * Expanders flag is [removed](https://github.com/Azure/azure-rest-api-specs/pull/26440?expand=1&template=data_plane_template.md) from [AutoscalerProfile](https://learn.microsoft.com/azure/aks/hybrid/work-with-autoscaler-profiles#profile-settings) from 2023-11-01-preview API since it may cause confusion with existing Expanders.
+
+* Component Updates
+  * Windows Kubernetes CVE fixes for [CVE-2023-5528](https://github.com/advisories/GHSA-hq6q-c2x6-hmch).
+  * Update ama-logs addon image to [3.1.16](https://github.com/microsoft/Docker-Provider/blob/ci_prod/ReleaseNotes.md).
+  * Windows Server 2019 image has been updated to [17763.5206.231213](https://github.com/Azure/AKS/blob/2024-01-08/vhd-notes/AKSWindows/2019/17763.5206.231213.txt).
+  * Windows Server 2022 Image has been updated to [20348.2159.231213](https://github.com/Azure/AKS/blob/2024-01-08/vhd-notes/AKSWindows/2022/20348.2159.231213.txt).
+  * Azure Linux image has been updated to [Azure Linux - 202401.03.0](vhd-notes/AzureLinux/202401.03.0.txt).
+  * AKS Ubuntu 22.04 image has been updated to [AKSUbuntu-2204-202401.03.0](vhd-notes/aks-ubuntu/AKSUbuntu-2204/202401.03.0.txt).
+
 ## Release 2023-11-28
 
 Monitor the release status by regions at [AKS-Release-Tracker](https://releases.aks.azure.com/).