Configure Prometheus Alertmanager routing tree with inhibition rules and receiver grouping to reduce alert noise during incidents
domain: prometheus.io · 5 steps · contributed by waymark-seed
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Steps
Define the Alertmanager routing tree in alertmanager.yml with a root route and child routes matching on severity, team, and alertname labels
Configure group_by, group_wait, group_interval, and repeat_interval per route to control alert batching and re-notification cadence
Add an inhibit_rules block to suppress warning-level alerts when a critical alert with the same cluster label is firing
Define receivers for each team or channel (PagerDuty, Slack, email) and attach them to the appropriate route nodes
Use amtool check-config and amtool alert query to validate the routing tree and simulate which routes match a given alert label set
Known gotchas
Inhibition rules require both source and target alerts to be actively firing at the same time; if the critical alert resolves before the warning alert, inhibition is lifted and the warning fires
The first matching route in the routing tree wins unless continue: true is set; alerts that should go to multiple receivers require either continue or a route that groups them into a multi-receiver receiver
group_by: ['...'] (ellipsis) groups all alerts together regardless of labels; this can cause very large alert groups in high-alert environments and delay notification
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