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Ashwanth 852becf227 results cache: add new stat `query_length_served` to measure cache effectiveness (#11589) ... **What this PR does / why we need it**: cache hit rate that is currently being measured using metrics and stats does not account for the fact that a cache hit could return partial results. When we query the cache for a key, we get back a list of extents and these need no cover the entire (split) range of the cache key. This pr adds a new cache stat called `query_length_served` to better measure the cache effectiveness. ``` query_length - sum(length of downstream queries) ``` **Which issue(s) this PR fixes**: Fixes #<issue number> **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [x] Documentation added - [x] Tests updated - [x] `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) - [ ] 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](0d4416a4b0)		2 years ago
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context.go	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	2 years ago
context_test.go	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	2 years ago
stats.pb.go	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	2 years ago
stats.proto	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	2 years ago