amtool silence add alertname=HighCPU -d 1h -c 'scheduled maintenance' -a alice
Silence alerts matching a label matcher
Short-form silence creation: match alerts with alertname=HighCPU and mute them for one hour (-d). -c sets the comment and -a the author, both shown in the Alertmanager web UI. The flag is -d/--duration, not the --expires form older documentation shows.
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