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Werk #19277: Linux agent: Prevent mislabelled Checkmk server

Component Checks & agents
Title Linux agent: Prevent mislabelled Checkmk server
Date Feb 13, 2026
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.6.0b1
Not yet released 		Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.5.0b1
Not yet released 		Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The issue:

Previously, monitored Linux hosts with installed Checkmk server package, but without Checkmk site, were incorrectly labelled with cmk/check_mk_server:yes.

Details:

If the omd command is available on a monitored Linux host, the Linux agent reports agent sections about available Checkmk installations and sites. This is the case as soon as any Checkmk version is installed on the host. On the server side, the host then got automatically labelled with cmk/check_mk_server:yes

However, as long as no Checkmk site is created on the host, there is no Checkmk server. Hence, we now only label the host as Checkmk server if one or more Checkmk sites are created on the monitored system.

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