Like Prometheus, but for logs.

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Danny Kopping bcd03150c9 Query-frontend: customisable query splitting for queries overlapping `query_ingester_within` window (#11535) ... **What this PR does / why we need it**: The config option `query_ingesters_within` defines the window during which logs _could_ be present on ingesters, and as such queriers will send queries to ingesters instead. `split_queries_by_interval` is defined to split queries into subqueries for increased parallelism. Aggressive query splitting within the `query_ingesters_within` window can result in overloading ingesters with unnecessarily large numbers of subqueries, which perversely can impact writes. `query_ingesters_within` is set to 3h by default. In Grafana Cloud Logs we set `split_queries_by_interval` as low as 15m (defaults to 1h), which would result in result in 3*60/15=12 requests. Every querier queries every ingester during this window, so that's 12 requests _per ingester per query_ which has the `query_ingesters_within` window in its time range _(i.e. a query from now to now-7d would include the `query_ingesters_within` window as well, now-3h to now-7d would not)_. However, we _do_ want to split queries so an ingester won't have to handle a query for a full `query_ingesters_within` window - this could involve a large amount of data. To account for this, this PR introduces a new option `split_ingester_queries_by_interval` on the query-frontend; this setting is disabled by default. 		2 years ago
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exporter.go	config: adds `frontend.max-query-capacity` to tune per-tenant query capacity (#11284)	2 years ago
exporter_test.go	only exports tenant limits which differ from defaults and export defa… (#4542)	4 years ago
limits.go	Query-frontend: customisable query splitting for queries overlapping `query_ingester_within` window (#11535)	2 years ago
limits_test.go	chore: restructure compactor package (#10775)	2 years ago
rate.go	Refactor per stream rate limit (#4213)	4 years ago
validate.go	Use metrics namespace for more metrics (#11025)	2 years ago