I would prefer the following output to conform to elog.c output:
2018-06-25 17:32:46.854 CEST [23265] LOG: connection authorized: user=postgres database=postgres application=[unknown]
Hello Gilles,
The different cases were for Stephen's request earlier in this thread. I'm happy to write it either way and agree it would be nice to not have a lot of duplicate code. Do you want me to submit another patch?
I think it’s better to not change the line when application name isn’t being set, as the latest patch has. That also matches how we handle the SSL info- it’s only shown if ssl is in place on the connection.