Run capacity scan on virtulization host?

I have installed/configured ILMT but not sure how to use VM Manager Tool so in search of it over internet didn’t found any document, however post installation of VM Manager tool run capacity scan on virtulization host gets activated, what does this mean ? will it only require & will run on ESXi host ? or it can be run on virtual servers which are showing in console, & if it can be run on virtual server then why its getting failed on all virtual servers.

Note - we have not integrated vcenter with our bigfix infra.

Here is a link to doc regarding vmmanagers: