Currently there is only proxy.process.ssl.total_success_handshake_count which only counts the number SSL connections negotiated between ATS and the clients. It would also be interesting to know the number of SSL connections that ATS negotiates with the origin servers.
We should also update the name of the current counter to make it clear that it is only tracking incoming SSL connections.
I propose adding
proxy.process.ssl.total_success_handshake_count_in (the current proxy.process.ssl.total_success_handshake_count) and proxy.process.ssl.total_success_handshake_count_out.
We will add an alias to keep around the existing stat name but deprecate it.