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Werk #19067: cleanup_old_configs: Keep the two latest serials

Component Core & setup
Title cleanup_old_configs: Keep the two latest serials
Date Mar 19, 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 Ultimate MT
2.5.0b2
Not yet released
Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

For the Nagios core, immediately after config generation, all but the latest config serial were deleted. This could lead to race conditions.

To prevent this, the two most recent config serials are retained.

This improvement enhances the stability and reliability of Nagios configuration handling. Users do not need to take any manual action to benefit from this change.

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