We are seeing multiple cases of the same problem too - vROps version 6.0.1 and also 6.1 affected. Metrics are showing disk space is clear and down below 25% usage, but critical alert > 98% still flagging.
Have manually cancelled alert, restarted vSphere adapters, stops and restarted collections on the VM (via Environment Overview) and no success on this occasion. (Sometimes, however, restarting the collection has cleared the alerts ok on other VMs)
We have also stopped and restarted VMTools.
Any suggestions would be greatly appreciated!
Paul