I have a custom MIB for monitoring ESX VMFS disk space. It successfully returns the percentage of disk space used on the VMFS volume, but I don't understand how I can create an alert on this. I can create an Advanced Alert with a Trigger Condition that says if the Poller Name is equal to VMFS_Space (my custom MIB name), but how do I set the criteria that says if it goes above 80% send me an alert?