Werk #22579: job: no crash on negative real time

Component	Checks & agents
Title	job: no crash on negative real 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 a job monitored via mk-job reported a negative real time, the Job service crashed with ValueError: Cannot render negative timespan. This happens when the system clock is set back while the job is running, for example by a job that runs chronyc makestep.

The service now goes to WARN and reports the negative value with a hint to check the system time. The exit code and job age are evaluated as before.

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