I had this working... I thought. I matched the traffic statistics on one of my Cisco ASA site-site tunnels with the OID:220.127.116.11.18.104.22.168.22.214.171.124.126.96.36.19942 (cipSecTunHistInOctets). I was real proud of myself for a few days until I checked the history and the graphs disapeared in Orion.
After some troubleshooting I found that the last four digits (4142 in this case) change whenever the tunnel drops and re-establishes itself. I imagine with some programming you could figure out a way to recognize the tunnel drop and dynamically figure out the new tunnel number but I need something a little simpler.
Has anyone managed to figure out a way to measure tunnel utilization on an ASA?