SNMP monitoring frame time

The 2.6 MIB includes up/down total available, used and overhead frame time per second.  Does anyone monitor these values and/or find value in them?

I'm hoping to see the % used come up in SNMP since I feel that would be extremely easy to monitor and set alarms for. Until that arrives, though, I'd like to have something to keep an eye on.

i do record those values, but my snmp software won't calculate % for me.    I do check them manually from time to time to make sure we are not over doing things. it would be nice if a pre caculated output could be recorded like whats displayed on the gui. 

Do you have any warning/alert conditions?  Do you just check to see if the available frames is >0 ?