Werk #13185: esx_vsphere_hostsystem_mem: added cluster check

The cluster check "esx_vsphere_hostsystem_mem_cluster" was configurable in the enforced services and was working up until Checkmk version 1.6. This check has been removed. Instead, the cluster functionality has been implemented and consolidated with the standard check for memory utilization of ESX vSphere host systems, "esx_vsphere_hostsystem_mem_usage". As a result, the ruleset has also been consolidated. Please migrate any rules configured for the cluster check "esx_vsphere_hostsystem_mem_cluster" to the new ruleset "Main memory usage of ESX host system" to continue using it.

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