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Karsten Jeschkies f67fff3eb2 Approximate `quantile_over_time` (#10417) ... **What this PR does / why we need it**: This change shards `quantile_over_time` queries using t-digest or DDSketch approximations. It can be enabled with `querier.shard_aggregations=quantile_over_time`. Outstanding - [x] Replace generic return type of `StepEvaluator` with interface `StepResult`. - [x] Send mapped query with quantile sketch expression from frontend to querier over the wire. - [x] Serialize sketches. See https://github.com/influxdata/tdigest/issues/34 - [x] Add feature flag. **Checklist** - [x] 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 - [x] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [x] 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: Callum Styan <callumstyan@gmail.com> Co-authored-by: Callum Styan <callumstyan@gmail.com>		3 years ago
..
metadata	Eager stream merge (#8968)	3 years ago
stats	Bloom-Gateway cache (#11380)	3 years ago
LICENSE_APACHE2	Re-license to AGPLv3 (#3630)	5 years ago
error.go	bug(volume): return 400 error for invalid volume request (#11313)	3 years ago
logqlmodel.go	Approximate `quantile_over_time` (#10417)	3 years ago