Based on an e-mail discussion, I am opening this bug to track SSL statistics.
To summarize from (http://mail-archives.apache.org/mod_mbox/trafficserver-users/201607.mbox/browser)
1. 'proxy.process.ssl.total_success_handshake_count' is a derived metric. However it is listed under 'RECT_PROCESS' which is owned by traffic_server as per the code. I feel this should either be under 'RECT_NODE' if it still needs to be a derived metric. If not, it should not be a derived metric. Instead, it should be redefined in traffic_server.
I haven't looked into any other ssl stats as of now.