* Alerting: Fix support for converted Prometheus rules in app-platform apis
Retrieving converted Prometheus retrieval rules was not supported in the app-platform apis and was throwing a 500 error due to the provenance not being handled properly.
Also adds a test to cover converted Prometheus rules when getting rules.
Closes https://github.com/grafana/alerting-squad/issues/1200
* add test to confirm provenance compatibility
This adds validating admission hooks to enforce the requirements on AlertRules and RecordingRules that are currently enforced through the provisioning service and storage mechanisms in preparation of a consistent validation in both legacy storage and unified storage. It also adds a mutating admission hook to the app to ensure that folder annotations and folder labels are kept in sync so we can perform label-selector lists.
This renames `data` to `expressions` for clarity in the rules apis.
Also makes certain fields that are redundant optional in the case of pure expressions, so that users don't have to specify them when they are not needed (e.g. not datasource queries).
Rules created in the new api makes the rule have no group in the database, but the rule is returned in the old group api with a sentinel group name formatted with the rule uid for compatiblity with the old api.
This makes the UI continue to work with the rules without a group, and the ruler will continue to work with the rules without a group.
Rules are not allowed to be created in the provisioning api with a NoGroup sentinel mask, but NoGroup rules can be manipulated through both the new and old apis.
Co-authored-by: William Wernert <william.wernert@grafana.com>
The first version of the app platform apis for alerting rules, including AlertRule and RecordingRule definitions.
Co-authored-by: William Wernert <william.wernert@grafana.com>
