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Christian Haudum 17577b4d47 Shut down query frontend gracefully (#7978) ... **What this PR does / why we need it**: This PR fixes a bug in the shutdown process of the query frontend. In order to shut down the frontend gracefully without cancelling any in-flight operations/sub-requests, the frontend service has to wait until all in-flight operations are finished. Only then its sub-services may be stopped. In order to control the deterministic order of the shutdown of the service and its child services, child services need to be started with their own context (not with their parent context). Otherwise, if the context of the frontend is cancelled, also the contexts of the child services are cancelled, leading to a parallel stopping of the parent and its child services. During the time of the shutdown, the `RoundTripGRCP` function still needs to accept any round-tripping requests. This is, because the frontend round tripper is wrapped into a query range tripper ware, which splits incoming (HTTP) query requests into multiple (gRPC) query requests if needed. **Which issue(s) this PR fixes**: This fixes a race condition where queries fail, because the query frontend shut down before the queriers that processed in-flight request could send the query response to the frontend. This manifested in an increased error rate of queries during restarts (rollouts) of the query frontend. **Special notes for your reviewer**: **Checklist** - [x] Reviewed the `CONTRIBUTING.md` guide - [x] Documentation added - [x] Tests updated - [x] `CHANGELOG.md` updated - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` Signed-off-by: Danny Kopping <danny.kopping@grafana.com> Signed-off-by: Christian Haudum <christian.haudum@gmail.com> Co-authored-by: Danny Kopping <danny.kopping@grafana.com>		3 years ago
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frontendv2pb	Update Prometheus dependency to latest release (v2.40.4) (#7826)	4 years ago
frontend.go	Shut down query frontend gracefully (#7978)	3 years ago
frontend_scheduler_worker.go	Shut down query frontend gracefully (#7978)	3 years ago
frontend_test.go	Shut down query frontend gracefully (#7978)	3 years ago