Werk #12798: Update of vanished host labels

Component	HW/SW inventory
Title	Update of vanished host labels
Date	May 7, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Vanished host labels would not update. This issue is now resolved. This was caused by old host labels not getting removed during discovery.

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