On 12th of April, Magnus Hagander committed patch:
Add system view pg_stat_ssl This view shows information about all connections, such as if the connection is using SSL, which cipher is used, and which client certificate (if any) is used. Reviews by Alex Shulgin, Heikki Linnakangas, Andres Freund & Michael Paquier
Continue reading Waiting for 9.5 – Add system view pg_stat_ssl