Werk #22764: Number of threads: maximum reported as 0

Component	Checks & agents
Title	Number of threads: maximum reported as 0
Date	Oct 16, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p18 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p39 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

If the agent reported 0 as the maximum number of threads of a host, the service Number of threads crashed with ZeroDivisionError: float division by zero.

The service now checks the number of threads as usual and omits the thread usage in percent, which cannot be computed without a valid maximum. This is the same output as for hosts whose agent reports no maximum at all.

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