Werk #19528: Fix HyperV Checkpoints crash on negative checkpoint age

Component	Checks & agents
Title	Fix HyperV Checkpoints crash on negative checkpoint age
Date	Mar 25, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.5.0b2 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p26 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p47 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously, the HyperV Checkpoints service crashed with a ValueError: Cannot render negative timespan when the HyperV agent reported a negative checkpoint age. This can happen due to clock skew between the monitored host and the Checkmk server.

The service now reports WARN with a message indicating the negative age and advising to check for clock skew.

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