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DevOps & Automation · Intermediate

Alertmanager

The Prometheus component that deduplicates, groups, routes, silences, and inhibits alerts and sends notifications.

Definition

Prometheus evaluates alert rules and forwards firing alerts to Alertmanager, which routes them by label to receivers such as email, Slack, PagerDuty, or webhooks. Grouping and inhibition reduce alert noise.

Example

A route sends severity=critical alerts to PagerDuty and everything else to a Slack channel.

Exam tip

Prometheus decides when an alert fires; Alertmanager decides who gets notified and how.

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