log_line_prefix = '%t [%p]: [%l] %qapp=%a '
which is modeled after the pgfouine recommendation, which is I believe a
wide-spread convention, and it also vaguely follows syslog customs.
The build farm client has
log_line_prefix = '%m [%c:%l] '
which is very similar, but the lack of the PID makes it unsuitable for
the purposes that I have set out, and there is no obvious place to put
additional information such as %a.
%m vs %t is obviously a minor issue that I will gladly adjust, but
besides that I prefer to stick with my version.
v2 patch looks ok, applies without trouble and works as intended:
2016-08-26 09:19:31.191 CEST :  app=pg_regress/event_trigger
STATEMENT: alter type rewritetype alter attribute a type varchar cascade;
About the format: '[\d+]' pattern is used twice, which makes the output
less easily grep-able.
Also, the ':' is used as a separator in the remainder of the message, so
maybe once is enough at this level.
I'm not sure about the "app=" is really necessary, given its very explicit
definition as can be seen above above.
So I would suggest something like the following, which is also a little
bit more compact:
log_line_prefix = '%m [%p:%l] %q%a '
If you want to keep something with %a, maybe parentheses?
Finally I'm wondering also whether a timestamp since the server has
started (which does not exists) would be more useful for a "make check",
or at default maybe %n?
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