Silence does not seem to work until the alert is received from prometheus

[primeroz]

What did you do?

• Had a Pending Alert in prometheus with alertname=MyPendingAlert
• Created a Silence in alertmanager for alertname=MyPendingAlert

What did you expect to see?
When the Alert went into Firing state and prometheus sent it to alertmanater i expected any notification for the alert to be suppressed

What did you see instead? Under which circumstances?
The initial notification was not suppressed and a new alert was created , in my case, in opsgenie.

After that no further notification were sent and the alert was properly silenced

Environment

• System information: GKE 1.14.10
• Alertmanager version: 0.20.0
• Prometheus version: 2.16.0

[simonpasquier]

You'd need to provide your configuration as well as Alertmanager logs (ideally with -log.level=debug).

[primeroz]

Sure can do , but i will need a bit of time to get around doing all of it and replicate the issue