[mrtg] mrtg on OS X working / cpu usage?

[subs at mxr.at]

Hi!

I finally managed to get mrtg working on my MAC OS 10.5 Server for my two
interfaces (en0,en1), now I am wondering if it is possible to monitor the
cpu usage / disk usage with mrtg?

I was googling for this, but did not find a guide for os x. Anyone knows
if this could be done and if how? :-)

Thanks in advance so much,
Chris