[FEATURE REQUEST] Alertmanager metrics for silenced alerts

[arctic-sharar]

Problem Statement

Prometheus supplies an ALERTS metric tracking the firing alerts. Alertmanager has the ability to silence metrics. But there is no metrics exposed by Alertmanager to track the alerts that are silenced.

Proposed Solution

Introduce an alertmanager metric for alerts that are being silenced. This can further be extended to other types of suppressions (inhibition rules)

Benefits

• Improved tracking of silence
• Better Auditing

[grobinson-grafana]

You might be looking for alertmanager_marked_alerts where state=suppressed? This includes other suppressions though, such as inhibitions. Did you want separate metrics for silences and inhibitions?