Haven't used MRG myself but on looking at the documentation at:
http://www.redhat.com/docs/en-US/Red...nterprise_MRG/
It appears to be designed to spread the load over several systems. As such monitoring of CPU in and of itself wouldn't seem to be meaningful.
That seems to be born out by the tuning guides seen at above site (there is one for Real Time). Both mention using "ftrace" to track "latencies" and my read of that suggests it is the closest analogue you'll find.
