Werk #12958: add validation for custom tags to REST API

Component Core & setup
Title add validation for custom tags to REST API
Date Sep 13, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p10 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Previously, host attributes which were custom defined could not be used in the REST API due to a missing validation step. This Werk fixes this. Custom attributes can now be used in the REST API as soon as they are created (e.g. using the Setup GUI).

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