Slack Integration validation

[pratikgajjar]

Tell us about the problem you're trying to solve

A way to test slack integration working. We don't know if alert aren't being raised via CG or it's just slack integration that is broken.

Describe the solution you'd like

Metabase / Sentry etc provides way to validate if slack integration is working.

Describe alternatives you've considered

Tried to use test data set with some low alert threshold, didn't get the alert.

Additional context

Add any other context or screenshots about the feature request here.

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