Werk #22607: Kubernetes: no crash on future start time

Component

Checks & agents

Title

Kubernetes: no crash on future start time

Date

Oct 6, 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
2.5.0p16 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

If the clock of a Kubernetes cluster ran ahead of the clock of the Checkmk server, the Container service of a running container could crash with ValueError: Cannot render negative timespan, because the container appeared to have been started in the future.

The service now goes to UNKNOWN, states that the container is running and how far its start time lies in the future, and asks you to check the system time.

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