alerts config questions

had you test this:
 
COLOR=red,!yellow 
 
in the hobbit-alerts.cfg?


Are there any known issues with the hobbit-alerts.cfg handling of
colors?

 
I ask because I set up some rules and specified COLOR=red, yet when the
service I am testing on goes yellow, we are receiving email alerts.

I only want to receive the alert for the critical case, not the warning
case.  

 
Any ideas?