Werk #18586: Fix DRBD agent to collect all volumes, not just volume 0

Component

Checks & agents

Title

Fix DRBD agent to collect all volumes, not just volume 0

Date

Apr 9, 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
2.5.0	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p26	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, the DRBD agent section only collected data for volume 0 from the sysfs path, missing any additional volumes. On DRBD 9.x setups with multiple volumes, this meant incomplete monitoring data.

The agent now collects data for all volumes.

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