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 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0p32 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

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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