Non-Cluster ESXi on vCenter

Hello

We have a Central vCenter with some clusters. There is everything ok.

Further do we have some ESXi which are not part of a cluster. They are shown in the Totals but no details about VMs running.

Similar as https://forum.xorux.com/discussion/1090/vmware-esxi-standalone-hyper-v-support

We are on lpar2rrd Version 7.81.

Under "Totals" - "Configuration" I can see the ESX servers. The are shown in a Cluster which does not exist anymore and those ESXi hosts were never part of this cluster. We do not see any "NONCLUSTER menu".

Is there a way to rescan the whole ESX-vCenter Environment?

We also see some directory structure are not current.

Somewhere else with issues like this?