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The Last Boot alert would probably be the best method. Likely the guest OS and / or CMOS time is off. VMWare can do some interesting things with VMWare tools and time synchronization. Basically the guest OS comes up with the CMOS time (which could be wildly off) and it's not until the VMWare tools service (or NTP client) starts before the time gets synch'd. Check out: http://www.vmware.com/files/pdf/Timekeeping-In-VirtualMachines.pdf
Thanks for that info Rob.
In watching this alert over the past few days, it seems that we are getting alerted right at, or roughly at 2 minutes after the reboot event itself... which Polling metric controls how often this particular field is populated...? I thought it was "Node Statistics", but that is set for 10 minutes and I can't find any Reboot alert that shows up at more than 2 minutes..?
You could also monitor for SysUptime, generating an alert when SysUptime is below <polling interval>
Just be aware that restarting the snmp agent on Windows, linux or whatever OS you're running would also generate an alert.