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Werk #19538: Monitored on relay: "No relay" override was ignored for hosts in a relay folder

Component Relay
Title Monitored on relay: "No relay" override was ignored for hosts in a relay folder
Date Jun 18, 2026
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
3.0.0b1
Not yet released
Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p8
Not yet released
Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When a folder was configured to monitor its hosts via a Checkmk Relay, a host or subfolder that overrode the Monitored on relay attribute to No relay was still treated as a relay host. Running a service discovery on such a host failed with:

[agent]: This data source is not supported for relay hosts.

The override is now respected: a host or subfolder explicitly set to No relay is no longer monitored via the relay, and its agent and other data sources work as expected. This also applies when the No relay setting is inherited from a subfolder that overrides a relay set on a parent folder.

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