Werk #22469: WMI checks: accept levels that are stored as a list

Component	Checks & agents
Title	WMI checks: accept levels that are stored as a list
Date	Sep 22, 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 2.5.0p15 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p38 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Depending on how the levels of a WMI based check were configured, they reached the check as a list instead of a pair of values. If only the upper levels were set, the service went UNKNOWN with TypeError: can only concatenate list (not "tuple") to list and produced a crash report instead of a result. Seen for example on DotNet Memory Management, but every check using the WMI levels helper was affected.

The levels are now accepted in either form, and the affected services are monitored against them again.

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