SNMP and Proxy Stats

I’m looking to gather information about proxy performance via SNMP. I’d like to know:

hits
received from servers
sent to clients
hits sent to clients

I did an snmpwalk of the entire 1.3.6.1 OID and did not see any MIB names or values that seemed to match the data that I’m looking for. My end game here is to get an exact percentage of how much internet traffic is being served from the proxy instead of going through the WAN. If anybody has some thoughts on alternative ways to do this, I’d be open to ideas.

Thanks in advance!

If SNMP doesn’t work for this because the MIB doesn’t have any values - I don’t know if it does one way or the other - you could use NetFlow to export all flows through the router and add up all flow data volumes, add up all flow data volumes sourced by the proxy (if necessary configure a loopback IP on the router and use that as the proxy source), and calculate the percentage that way.