OpManager on our Exchange 2010 server is alerting on “RPC Requests sent per Second”, being 288,000,000. This is an incorrect value.

This is actually the value of "RPC Requests sent" in total since the server was powered on.

The RPC sent/per sec is actually around 130 which is normal. I have confirmed this by running Perfmon on the Exchange server.

Is this a known bug with OpManager? We are running v10 build 11100.