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Kaviraj Kanagaraj 52a7c0fd36 ruler: Support `writeNotify` on Loki ruler (#10906) ... **What this PR does / why we need it**: prometheus ruler added a feature of notifying the reader when a sample is appended, instead of waiting in a loop burning the CPU cycles. https://github.com/prometheus/prometheus/pull/11949 This changes a default behaviour a bit. Now if `notify` is not enabled, next read is done only when next readTicker is triggered. **Which issue(s) this PR fixes**: Also should fix https://github.com/grafana/loki/issues/10859 **Special notes for your reviewer**: Adding few more details for the sake of completeness. We found this via more frequent failures of rule-evaluation integration tests linked on the issue above. After some investigation, we tracked down to prometheus changes. Prometheus introduced new type `wlog.WriteNotified` interface with `Notify()` method with a goal to notify any waiting readers, that some write is done. Two types implements this type `wlog.Watcher` and `remote.Storage`. `remote.Storage` implements `Notify()` by just calling it's queues `wlog.Watcher`'s `Notify()` under the hood. How are these types impacts Loki ruler? Loki ruler also uses `remote.Storage`. So when any samples got committed via `appender`, we have to notify the remote storage. **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](d10549e3ec) --------- Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>		3 years ago
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cleaner	Remove ruler.wal-cleaer.period (#10378)	3 years ago
instance	ruler: Support `writeNotify` on Loki ruler (#10906)	3 years ago
util	Ruler: per-tenant WAL (#4344)	5 years ago
wal	ruler: Support `writeNotify` on Loki ruler (#10906)	3 years ago