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Ed Welch a4eb536fb2 Loki: remove `subqueries` from metrics.go logging and replace it with separate split and shard counters (#8761) ... **What this PR does / why we need it**: Currently the `metrics.go` log line emitted after every query includes a metric called "subqueries". This currently tracks the number of queries created by the split_by_time operations done in Loki, but does not include any counts for subqueries created as a result of sharding. It becomes difficult to make a single subqueries counter that gives useful information to determine how much a query is split by time and sharded by a shard factor, especially now that sharding in TSDB indexes is dynamic. This PR removes and deprecates the `subqueries` stat and instead creates a `splits` and `shards` statistic which records how much a query was split_by_time and the total number of shards created as well. **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**) - [ ] 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: Edward Welch <edward.welch@grafana.com>		3 years ago
..
api	Docs: Add doc-validator tool to lint technical documentation (#6569)	3 years ago
best-practices	doc(best-practices): Update default value of `max_chunk_age`. (#8685)	3 years ago
clients	Fixing broken link (404) (#8688)	3 years ago
community	Fix documentation linter errors (#8229)	3 years ago
configuration	Loki: Change the behavior of the 0 value for retention_period to disable retention. (#8753)	3 years ago
design-documents	Fix documentation linter errors (#8229)	3 years ago
fundamentals	[Docs] Adding context to Istio installation. (#8248)	3 years ago
getting-started	Loki Getting Started: Fix example query that was not working (#8668)	3 years ago
installation	[CI/CD] Update yaml file `./production/helm/loki/values.yaml` (+1 other) (#8655)	3 years ago
lids	LID: Improve scheduler to control QoS across users within a tenant (#8585)	3 years ago
logql	Add logfmt selective label extraction (#6675)	3 years ago
maintaining	Fix documentation linter errors (#8229)	3 years ago
operations	Loki: Change the behavior of the 0 value for retention_period to disable retention. (#8753)	3 years ago
release-notes	Reflect release 2.7.3 on main branch (#8372)	3 years ago
rules	Fix documentation linter errors (#8229)	3 years ago
storage	tsdb docs first pass (#8048)	3 years ago
tools	logcli: Add parallel flags (#8518)	3 years ago
upgrading	Loki: remove `subqueries` from metrics.go logging and replace it with separate split and shard counters (#8761)	3 years ago
_index.md	Docs: Add doc-validator tool to lint technical documentation (#6569)	3 years ago
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