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Group alerts by service

Problem

The problem is described in detail in the epic, but in short, we alert multiple times about the same service in 1 go, which is distracting.

Proposal

Use Alertmanager Grouping so that we group all the alerts of 1 service that fire within the same time into 1 alert.

  1. Group alerts by [service, env, environment].
  2. Update the alerting template to specify which alerts are firing.

Result

gitlab-com/runbooks!4715 (comment 990528992)

Edited by Steve Xuereb