Werk #15771: discovery: remove vanished labels on 'Accept all'

Component	Checks & agents
Title	discovery: remove vanished labels on 'Accept all'
Date	Aug 14, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p33 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Vanished labels weren't beeing removed after clicking 'Accept all' in the discovery page. There was no way to remove vanished labels from the host using the UI.

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