Hi @nary
Personally I monitor both individually: The vCenter and each ESXi host. The rule to accomplish this has multiple options though, so you will need to modify it accordingly, e.g. don’t monitor VMs on the ESXi host but only through the vCenter. Otherwise you’ll have “vanished services” each time a VM is migrated…
To do this, you need to select “what” you’re monitoring with the rule: Is it a vCenter, or a hypervisor? I guess you probably figured the latter out on your own…
HTH,
Thomas