Werk #18328: (Linux) Memory graph: Directly use MemTotal

Component

Checks & agents

Title

(Linux) Memory graph: Directly use MemTotal

Date

Jan 15, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p20 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The mem_linux check plug-in computes MemUsed from MemTotal, MemFree and some other metrics. Then the related graph plug-in stacks all these metrics and computed the MemTotal (which is already available as a metric from the target host). This may be error prone when it comes to RRD consolidation (ie. there may be spikes when using max).

Now we directly use MemTotal in the related graph plug-in. The MemTotal is the physical RAM minus a few reserved bits and the kernel binary code.

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