Werk #13139: Add Alertmanager special agent and check plugins

Component	Checks & agents
Title	Add Alertmanager special agent and check plugins
Date	Aug 20, 2021
Level	Prominent Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Add special agent and check plugins for Alertmanager.

The special agent retrieves information from the Alertmanager rules API. It retrieves information about:

• alert rule groups
• alert rules
  1. name
  2. status
  3. severity
  4. message

The check plugin monitors

• Individual alert rules
• Alert rule groups
• Alert rule summary

For more information look at the respective manpages

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