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Werk #19679: Allow creation of host labels with multi-colon values

Component Setup
Title Allow creation of host labels with multi-colon values
Date Apr 15, 2026
Level Trivial Change
Class New Feature
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.6.0b1
Not yet released
Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Checkmk already supports reading and matching host and service labels whose value contains : (see werk #18706). However, creating such labels through the Setup UI or the REST API was rejected with the error message "Labels need to be in the format [KEY]:[VALUE]".

With this werk it is now possible to enter multi-colon label values from the Setup UI ("Host labels" / "Service labels") and from the REST API host and folder endpoints. A value like net:ip:v4 is stored verbatim and can be matched in rules as usual.

The label key still may not contain : because that character is used as the separator between key and value.

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