Werk #22574: ucd_mem: no crash on zero total RAM

Component

Checks & agents

Title

ucd_mem: no crash on zero total RAM

Date

Oct 5, 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 device monitored via the UCD SNMP memory table reported a total RAM of 0, the "Memory" service crashed with ZeroDivisionError: float division by zero.

The service now reports UNKNOWN with "Cannot evaluate RAM: device reports a total of 0 B". Swap errors reported by the device are still shown.

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