Like Prometheus, but for logs.

prometheushacktoberfestgrafanacloudnativeloggingloki

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Salva Corts 8cf921a145 Pass engine opts down to middlewares (#9130) ... **What this PR does / why we need it**: The following middlewares in the query frontend uses a downstream engine: - `NewQuerySizeLimiterMiddleware` and `NewQuerierSizeLimiterMiddleware` - `NewQueryShardMiddleware` - `NewSplitByRangeMiddleware` These were all creating the downstream engine as follows: ```go logql.NewDownstreamEngine(logql.EngineOpts{LogExecutingQuery: false}, DownstreamHandler{next: next, limits: limits}, limits, logger), ``` As can be seen, the [engine options configured in Loki][1] were not being used at all. In the case of `NewQuerySizeLimiterMiddleware`, `NewQuerierSizeLimiterMiddleware` and `NewQueryShardMiddleware`, the downstream engine was created to get the `MaxLookBackPeriod`. When creating a new Downstream Engine as above, the `MaxLookBackPeriod` [would always be the default][2] (30 seconds). This PR fixes this by passing down the engine config to these middlewares, so this config is used to create the new downstream engines. **Which issue(s) this PR fixes**: Adresses some pending tasks from https://github.com/grafana/loki/pull/8670#issuecomment-1507031976. **Special notes for your reviewer**: **Checklist** - [x] 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` [1]: 1bcf683513/pkg/querier/querier.go (L52) [2]: edc6b0bff7/pkg/logql/engine.go (L136-L140)		2 years ago
..
queryrangebase	Loki: Improve spans usage (#8927)	2 years ago
benchmarkutils_test.go	Loki Query Frontend (#1442)	5 years ago
codec.go	Expose optional label matcher for label values handler (#8824)	2 years ago
codec_test.go	Expose optional label matcher for label values handler (#8824)	2 years ago
downstreamer.go	Eager stream merge (#8968)	2 years ago
downstreamer_test.go	Eager stream merge (#8968)	2 years ago
extensions.go	TSDB/query-planning-groundwork (#6367)	3 years ago
limits.go	Pass engine opts down to middlewares (#9130)	2 years ago
limits_test.go	Pass engine opts down to middlewares (#9130)	2 years ago
log_result_cache.go	Loki: Improve spans usage (#8927)	2 years ago
log_result_cache_test.go	fix bugs in logs results caching and its tests (#7925)	2 years ago
metrics.go	adds result cache key version comparison metrics (#7323)	3 years ago
ordering.go	Loki Query Frontend (#1442)	5 years ago
prometheus.go	Ruler: remote rule evaluation (#8744)	2 years ago
prometheus_test.go	Loki: remove `subqueries` from metrics.go logging and replace it with separate split and shard counters (#8761)	2 years ago
queryrange.pb.go	Expose optional label matcher for label values handler (#8824)	2 years ago
queryrange.proto	Expose optional label matcher for label values handler (#8824)	2 years ago
querysharding.go	Pass engine opts down to middlewares (#9130)	2 years ago
querysharding_test.go	Pass engine opts down to middlewares (#9130)	2 years ago
roundtrip.go	Pass engine opts down to middlewares (#9130)	2 years ago
roundtrip_test.go	Pass engine opts down to middlewares (#9130)	2 years ago
shard_resolver.go	Pass engine opts down to middlewares (#9130)	2 years ago
shard_resolver_test.go	Max bytes read limit (#8670)	2 years ago
split_by_interval.go	Expose optional label matcher for label values handler (#8824)	2 years ago
split_by_interval_test.go	Max bytes read limit (#8670)	2 years ago
split_by_range.go	Pass engine opts down to middlewares (#9130)	2 years ago
split_by_range_test.go	Pass engine opts down to middlewares (#9130)	2 years ago
stats.go	Expose optional label matcher for label values handler (#8824)	2 years ago
stats_test.go	fix(stats_collector): Do not collect stats for failed requests. (#6878)	3 years ago