Backport instrumentation and recovery. #11090
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**What this PR does / why we need it**:
means inflight requests are not instrumented anymore. This change adds a
middleware that does that.
This will add metrics such as
```
cortex_inflight_requests{method="gRPC",route="*logproto.IndexStatsRequest"} 0
cortex_inflight_requests{method="gRPC",route="*queryrange.LabelRequest"} 0
cortex_inflight_requests{method="gRPC",route="*queryrange.LokiRequest"} 0
cortex_inflight_requests{method="gRPC",route="*queryrange.LokiSeriesRequest"} 0
```
**Checklist**
- [ ] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/setup/upgrade/_index.md`
- [ ] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](grafana@d10549e)
- [ ] If the change is deprecating or removing a configuration option,
update the `deprecated-config.yaml` and `deleted-config.yaml` files
respectively in the `tools/deprecated-config-checker` directory.
[Example
PR](grafana@0d4416a)
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poyzannur
approved these changes
Oct 31, 2023
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What this PR does / why we need it:
Checklist
CONTRIBUTING.mdguide (required)CHANGELOG.mdupdatedadd-to-release-noteslabeldocs/sources/setup/upgrade/_index.mdproduction/helm/loki/Chart.yamland updateproduction/helm/loki/CHANGELOG.mdandproduction/helm/loki/README.md. Example PRdeprecated-config.yamlanddeleted-config.yamlfiles respectively in thetools/deprecated-config-checkerdirectory. Example PR