Werk #12301: Fix cache usage for clusters

Component

Checks & agents

Title

Fix cache usage for clusters

Date

Jun 9, 2021

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.1.0b1	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p6	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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