George Robinson d96b0a71d3 Alerting: Add limits to the Prometheus Rules API (#65169)
This commit adds a number of limits to the Grafana flavor of the
Prometheus Rules API:

1. `limit` limits the maximum number of Rule Groups returned
2. `limit_rules` limits the maximum number of rules per Rule Group
3. `limit_alerts` limits the maximum number of alerts per rule

It sorts Rule Groups and rules within Rule Groups such that data in the
response is stable across requests. It also returns summaries (totals) for
all Rule Groups, individual Rule Groups and rules.
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Grafana

The open-source platform for monitoring and observability

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The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
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