Alertmanager – handles alerts sent by client applications

The Alertmanager handles alerts sent by client applications such as the Prometheus server. Prometheus is an open-source systems monitoring and alerting toolkit

It takes care of deduplicating, grouping, and routing them to the correct receiver integrations such as email, PagerDuty, or OpsGenie. It also takes care of silencing and inhibition of alerts.

This is free and open source software.

Core concepts that are implemented:

  • Grouping – categorizes alerts of similar nature into a single notification. This is especially useful during larger outages when many systems fail at once and hundreds to thousands of alerts may be firing simultaneously.
  • Inhibition – a concept of suppressing notifications for certain alerts if certain other alerts are already firing.
  • Silences – a straightforward way to simply mute alerts for a given time. A silence is configured based on matchers, just like the routing tree. Incoming alerts are checked whether they match all the equality or regular expression matchers of an active silence. If they do, no notifications will be sent out for that alert.
  • Client behavior – two APIs, v1 and v2, both listening for alerts. The scheme for v1 is described in the code snipped below. The scheme for v2 is specified as an OpenAPI specification
  • High availability – supports configuration to create a cluster for high availability.

Website: prometheus.io
Support: GitHub Code Repository
Developer: Prometheus Authors
License: Apache License, version 2.0

Alertmanager is written in Go. Learn Go with our recommended free books and free tutorials.

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