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Callum Styan 5a85f6647e Add initial implementation of per-query limits (#8727) ... **What this PR does / why we need it**: Sometimes we want to limit the impact of a single query by imposing limits that are stricter than the current tenant limit. E.g. the maximum query length could be seven days but based on the query or an admins decision a query should just have a maximum length of one day. This is where per-request limits come into play. They are passed via the `X-Loki-Query-Limit` header and extracted into the requests context. It is the responsibility of the operator or admin that the header is valid. **Which issue(s) this PR fixes**: Fixes #8762 **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 - [x] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` --------- Signed-off-by: Callum Styan <callumstyan@gmail.com> Co-authored-by: Karsten Jeschkies <karsten.jeschkies@grafana.com>		3 years ago
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combined_limits.go	Add initial implementation of per-query limits (#8727)	3 years ago
query_limiter.go	Remove `cortexpb` dependency from Loki packages. Use only `logproto` now. (#5264)	4 years ago