I've got certain services set to only notify me when they become critical, unknown or recover. However, many times I'll get notified (at some 2 AM on my cell) that RAM has gone critical on one of our servers...and then there's nothing...and then six hours later I'll see that it's back in an OK state.
This puzzled me for a bit, before I saw that I wasn't getting notified because the service was slipping from CRITICAL to WARNING, and I'm not set to receive notifications on warning.
What I'd like to know is if it's possible to be notified of a service's WARNING state ONLY if it goes from CRITICAL to WARNING. Any ideas?