Werk #19522: Fix crash when viewing parameters for services of third-party check plugins

Component

Setup

Title

Fix crash when viewing parameters for services of third-party check plugins

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
2.4.0p26 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.3.0p47 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously, opening the "Parameters for service" page in Setup for a discovered service could crash with a KeyError if the check plugin's checkgroup had no registered ruleset — which is common for third-party check plugins (e.g. infortend_chassis1).

The page now correctly shows "This check is not configurable via Setup" for such services instead of crashing with an internal error.

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