Graphing with MRTG something other than active leases?

[Nomad]

Is anybody else using MRTG to create graphs for ISC DHCP?  I have graphs for
the active and known leases but I've been asked to do the same for the
number of DHCPDISCOVER and other messages.  We've had several instances of
clients going nuts and flooding our servers with DHCPDISCOVER and we'd like
to keep track of this.
Any thoughts?  Suggestions?  Currently we're running v3.1.0 on a redhat
enterprise v4 server.
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