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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)		1 year ago
..
log	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
sketch	Approximate `quantile_over_time` (#10417)	1 year ago
syntax	Bloom querying: Propagate line filters from querier to bloom filter (#11492)	1 year ago
vector	Update Prometheus dependency (#9205)	2 years ago
blocker.go	Send query plan to querier. (#11246)	2 years ago
blocker_test.go	Send query plan to querier. (#11246)	2 years ago
downstream.go	Merge quantile sketches as they arrive (#11544)	1 year ago
downstream_test.go	Approximate `quantile_over_time` (#10417)	1 year ago
engine.go	Benchmark and improve sketch join (#11534)	1 year ago
engine_test.go	Approximate `quantile_over_time` (#10417)	1 year ago
evaluator.go	Approximate `quantile_over_time` (#10417)	1 year ago
evaluator_test.go	Send query plan to querier. (#11246)	2 years ago
explain.go	Approximate `quantile_over_time` (#10417)	1 year ago
explain_test.go	Approximate `quantile_over_time` (#10417)	1 year ago
limits.go	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
mapper_metrics.go	Use metrics namespace for more metrics (#11025)	2 years ago
mapper_stats.go	Fix instant query summary split stats (#9773)	2 years ago
matchers.go	allows filter-only matchers in series endpoint (#10269)	2 years ago
matchers_test.go	allows filter-only matchers in series endpoint (#10269)	2 years ago
matrix.go	Return `StepResult` from `StepEvaluator.Next()`. (#10567)	2 years ago
matrix_test.go	Return `StepResult` from `StepEvaluator.Next()`. (#10567)	2 years ago
metrics.go	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	1 year ago
metrics_test.go	results cache: add new stat `query_length_served` to measure cache effectiveness (#11589)	1 year ago
optimize.go	Approximate `quantile_over_time` (#10417)	1 year ago
optimize_test.go	fix panics when cloning a special query (#8531)	2 years ago
quantile_over_time_sketch.go	Merge quantile sketches as they arrive (#11544)	1 year ago
quantile_over_time_sketch_test.go	Benchmark and improve sketch join (#11534)	1 year ago
range_vector.go	Define sketches for quantiles. (#10659)	2 years ago
range_vector_test.go	Approximate `quantile_over_time` (#10417)	1 year ago
rangemapper.go	Send query plan to querier. (#11246)	2 years ago
rangemapper_test.go	Send query plan to querier. (#11246)	2 years ago
shardmapper.go	Approximate `quantile_over_time` (#10417)	1 year ago
shardmapper_test.go	Bloom querying: Propagate line filters from querier to bloom filter (#11492)	1 year ago
step_evaluator.go	Approximate `quantile_over_time` (#10417)	1 year ago
test_utils.go	Merge quantile sketches as they arrive (#11544)	1 year ago
tree_printer.go	Remove anonymous step evaluator and add `explain`. (#10400)	2 years ago
vector.go	Return `StepResult` from `StepEvaluator.Next()`. (#10567)	2 years ago