Like Prometheus, but for logs.

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Salva Corts 61d407b4bb Add keep stage to LogQL (#9693) ... **What this PR does / why we need it**: This PR adds a new `keep` stage to LogQL. It allows filtering specific labels and helps to avoid hitting the _max streams per query_ limit by keeping only specific labels in the label set. It works the opposite of [drop stage](https://grafana.com/docs/loki/latest/logql/log_queries/#drop-labels-expression). **Special notes for your reviewer**: We do not drop [special error labels](edc6b0bff7/pkg/logqlmodel/error.go (L18-L20)) added by Loki at query time. Users will have to explicitly drop them by using the drop stage. **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 - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_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) --------- Co-authored-by: Sandeep Sukhani <sandeep.d.sukhani@gmail.com> Co-authored-by: J Stickler <julie.stickler@grafana.com>		3 years ago
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analyzer	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
log_queries	Add keep stage to LogQL (#9693)	3 years ago
_index.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
analyzer.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
ip.md	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
logcli.md	Removing 'please' from the docs. (#9658)	3 years ago
metric_queries.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
query_examples.md	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
template_functions.md	Fix date template function with epoch times (#8886)	3 years ago