from time to time I need to correlate PostgreSQL logs to other logs, containing numeric timestamps - a prime example of that is pgbench. With %t and %m that's not quite trivial, because of timezones etc.
I propose adding two new log_line_prefix escape sequences - %T and %M, doing the same thing as %t and %m, but formatting the value as a number.
Patch attached, I'll add it to CF 2015-06.
I've wanted this before as well. But what is the point of %T? Does printing the milliseconds cause
some kind of detectable performance hit?
I don't think I've ever thought myself "You know, I really wish I hadn't included the milliseconds in that timestamp".
Same question for %t, but that ship has already sailed.