Werk #19710: kube_pod_uptime: Fix ValueError("Cannot render negative timespan")

Component	Checks & agents
Title	kube_pod_uptime: Fix ValueError("Cannot render negative timespan")
Date	Jun 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 2.5.0p8 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p33 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The uptime is the Pod's start time subtracted from the current time on the Checkmk server. If the Kubelet's clock is ahead of the Checkmk server's, this becomes negative and the service crashed with ValueError("Cannot render negative timespan").

The check now reports this as UNKNOWN, hinting at clock skew, instead of crashing.

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