I'm a recent Zenoss convert and have gotten everything running the way I want, creating and using my own template to monitor some unique equipment/information.  However, I desperately need to create a threshold to throw an alarm and I've gotten a bit confused as to how to do it.

The setup:

My Interface template collects two data sources (TotalUsers and ActiveUsers).  Both are gauges, and both are collecting the information needed.

Threshold Need:

I need a threshold created so that if the number of ActiveUsers is less than 70% of the TotalUsers for the interface it will create an event.

I've looked into the getRRDValue but it appears that I cannot reference the TotalUsers data point for the same interface that I'm looking at when I will be comparing the Active Users.

(Current setup: Name: ActiveUsers -- Min Value: getRRDValue(self,'TotalUSers_TotalUsers',start=None,end=None, function='LAST'') * .7)

If someone could please advise as to how this would be accomplished I would be forever grateful.

Many thanks in advance!

kw