Werk #12301: Fix cache usage for clusters

Component Checks & agents
Title Fix cache usage for clusters
Date Jun 9, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1 2.0.0p6
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The cache was not used properly for clusters. This resulted in performance problems such that, if an host was part of n clusters, it would be contacted n + 1 times. Now, we make sure that the host is contacted a single time and that checking for the clusters use locally cached data.

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