Alerting: Preview recording rules in the rule editor

[domasx2]

What would you like to be added:

When editing a cortex or loki recording rule in the rule editor, it should be possible to click "preview data" and see the rule evaluation result.

[gotjosh]

Scope of this for 8.2 can be that we just disable the button with a toolip.

[gillesdemey]

Closing this as a duplicate of #35699 and will follow-up there

[mellieA]

This looks like it was closed as a duplicate of itself. There are newer reports of this issue from internal/external users:

#60144
#59301

Will close the other two issues in favor of this one

[samjewell]

Additionally to the original report here:

The same, but for Mimir / Loki RECORDING rules

What would you like to be added:

When editing a cortex or loki RECORDING rule in the rule editor, it should be possible to click "preview RULE" and see the rule evaluation result.

Why is this needed:

Grafana managed alerts have this feature, but it is currently missing for cortex/loki RECORDING RULES.

further

The UI needs a complete update for recording-rules. The button text would say "preview rule", and the alerting chain should probably be removed, as it's not relevant for recording rules.

[gillesdemey]

Previewing Mimir / Cortex / Loki alerts has been implemented in #54950 previously

[armandgrillet]

From @VikaCep : we're explicitly excluding cloud-recording queries from preview as they don't seem to be supported. https://github.com/grafana/grafana/blob/main/public/app/features/alerting/unified/components/rule-editor/PreviewRule.tsx#L99
What is not clear to me if this is not supported because it's not implemented on the backend side (as we call the /api/v1/eval API to do it) or if it is purely frontend work that's missing. Do you know? FYI @gillesdemey

From @gillesdemey : Some initial work is being done in the alerting/preview-recording-rule branch; what we're hoping to be able to do is:

1. Render the correct editor for any of the supported datasources
2. Render a visualization for the time series that are being recorded in the rule by pressing the "preview" button.

We don't need expressions (since those aren't supported) and none of the usual config params are supported (no time range, no max data points, etc)

[gillesdemey]

Just not supported in the Front-end, no back-end changes need to be implemented 👍