Is there any way to create an advanced alert that triggers if a value has changed more than a certain amount? For example, I'm monitoring the temperature of my switches and I want to be alerted if the value has a "drastic" change in a short amount of time, say 10 degrees in 5 minutes. I suppose I could just create an alert with a threshold... but I'm really interested in alerting on trends. I think this could be useful for a lot of things besides temperature.
Any ideas?