Can see below error message in logs
error message: xxxxx is not responding (reason: unexpected exception occurred during data collection against datacollector for xxxxx)
Release : 20.4.x
robot 9.39HF1
vmware probe 7.21
esxi host 7.0 update 3
Windows Server 2019 Standard
Can see below message repeating in the vmware probe debug logs
Your vCenter collection level appears to be below the level required to collect all metrics.
Expected level is 3. If you're missing expected metrics please increase your vCenter collection level
So suggestion is to contact the vmware admin team about the Vcenter collection level