Add a metric with alertmanager_notifications_success_total

What did you do?

I would like to create an availability SLO using (good events)/(total_events) and currently, we don't have a proper way to check what was the notification that was sent with success.

With that in mind, it could be nice to have a alertmanager_notifications_success_total metric, since alertmanager already has alertmanager_notifications_total and alertmanager_notifications_failed_total

What did you expect to see?

A way to identify alerts that was sent with success.

What did you see instead? Under which circumstances?

N/A

Environment

• System information:

  N/A

• Alertmanager version:

  0.24.0

• Prometheus version:
  N/A

• Alertmanager configuration file:
  N/A

• Prometheus configuration file:
  N/A

• Logs:
  N/A

Start by locating the existing alertmanager_notifications_total and alertmanager_notifications_failed_total metrics in the Alertmanager code and their tests. Check how notification outcomes are recorded, then add coverage for the requested success metric and verify it supports identifying successfully sent notifications.