I'm using the free health monitor to monitor our XenServer VDI environment and I notice that any time the VMTurbo VM is rebooted I not only lose the dashboard info (which I expected) but I also lose historical info in my reports. For example, if I try and run "VM Over/Under Provisioning 30 Days" after a reboot the report is empty. Prior to the reboot the report ran and had information in it. I thought I read in the forums and elsewhere that only the dashboard metrics (the last 2 hours) were cleared after a reboot, but that the collected metrics were still available for reports.
I just updated to 5.2 from 5.1 thinking perhaps it was a bug but I still get the same behavior.