Werk #19306: inventory_kube_statefulset: Fix crash when parsing update strategy

Component	Checks & agents
Title	inventory_kube_statefulset: Fix crash when parsing update strategy
Date	Feb 16, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p22 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Werk #15084 introduced support for the maxUnavailable field for StatefulSets with RollingUpdate.

The value is displayed in the inventory tree for StatefulSets.

A crash was later discovered which occurred when the field returned an integer rather than a string.

This resulted in a crash of the Kubernetes special agent with a ValidationError.

This bug is now fixed.

Notably, Kubernetes v1.35 enables the feature gate MaxUnavailableStatefulSet by default (graduated to Beta), causing this bug to be seen more commonly.

No interaction is required from users to make use of this fix.

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