Werk #18966: Ruleset API: Fix validation for different FormSpecs

Component

Checks & agents

Title

Ruleset API: Fix validation for different FormSpecs

Date

Nov 11, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Incompatible - Manual interaction might be required

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p17	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p41	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

This werk is relevant for you if you are a plugin developer using validation functions within the ruleset API.

Several ruleset API v1 FormSpecs did not trigger any validation when using the custom_validate field, allowing invalid input to be accepted. The following FormSpecs were affected:

BooleanChoice
CascadingSingleChoice
FixedValue
HostState
Metric
MonitoredHost
MonitoredService
Password
Proxy
ServiceState
TimePeriod

No shipped rulesets could be identified as affected.

Configurations made with affected rulesets (e.g. provided by MKPs) will now become invalid and must be adjusted manually.

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