Werk #18860: Validate host conditions in rules on update

Component	Setup
Title	Validate host conditions in rules on update
Date	Oct 29, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p16 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p40 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Since 2.3, host names in rule host conditions are validated.

Previously, users sometimes entered a pattern like 'MYHOST*' without prefixing it with '~' to mark it as a regex. In such cases, the ruleset pages could break.

Now, the pre-update check also validates host conditions. The update can be aborted if invalid values are detected, preventing broken rulesets.

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