Werk #18020: docker_container_status_health: fix check when health logs are empty

Component

Checks & agents

Title

docker_container_status_health: fix check when health logs are empty

Date

May 6, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.3.0p33	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The check plugin crashed with the error

  File "/omd/sites/site_name/lib/python3/cmk/base/plugins/agent_based/docker_container_status.py", line 183, in check_docker_container_status_health
    last_log = health.get("Log", [{}])[-1]

This happened because the Log field in Docker's health check status can be an empty list ("Log": []) when a health check is defined but has not yet produced any results - this can typically occur during the initial startup period.

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