Werk #19841: multipath: don't crash when numpaths is 0

Component

Checks & agents

Title

multipath: don't crash when numpaths is 0

Date

Apr 21, 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 Cloud, Checkmk Ultimate MT
2.5.0p1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p29	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.3.0p47 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

When a multipath group had numpaths equal to 0 (for example because all discovered paths had been removed from the device map between discovery and the next check cycle), the check crashed with a ZeroDivisionError while computing the active-path percentage.

The check now reports a CRIT state with "No paths" and continues to yield the remaining information instead of crashing.

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