Werk #23002: Proxmox VE: don't crash on a truncated backup cache

Component

Checks & agents

Title

Proxmox VE: don't crash on a truncated backup cache

Date

Nov 3, 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
2.5.0p19 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

If the backup log cache file of the Proxmox VE special agent was truncated, the agent crashed with a JSONDecodeError on every run. All services of the monitored Proxmox VE hosts then went stale until the file was removed by hand.

The agent now discards an unreadable cache, fetches the backup logs again and rewrites the cache.

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