Making a PF Rule that i can process with a graphing application

[David Schulz]

Hello,

i would like to monitor my Network Card`s load using Zabbix (like  
nagios, but cooler IMO) , and someone has suggested to make a Rule in  
ipfw like "ipfw count in me out !me via re0" , which he then can  
process with zabbix agent. The problem is, i dont use ipfw, but pf,  
and i dont know how a rule like that could look like using pf. Can  
anyone help me out?

Thanks a lot for any suggestion,
David