On most of my servers, daily they run some back end maintenance jobs nightly.  It is expected that the CPU and RAM will be very heavy during this 1 hour window, we do not need to be notified.  We do need to be notified if the server or a service is down.  The rest of the day, we need the regular Threshold and Availability profile to notify us if the user experience might be suffering due to unexpected CPU or RAM utilization.  It would be great if we could assign a second Threshold and Availability profile like a recurring maintenance window.  Notifications would not go away entirely just the criteria would change.