We have observed random CVM's not getting discovered in UIM.
Release : 20.3
Component : UIM - NUTANIX
CVMs are discovered. The VM name gets populated from PRISM using the below API
https://<cluster IP>:<port>/PrismGateway/services/rest/v1/vms/?count=10&page=1
VM info gets fetched from above API and same VM name that is present in PRISM cluster VM is displayed the UIM as well.
Please make sure this name is searched for.