Re: log_line_prefix and JSON log format

On Fri, Sep 25, 2026 at 12:36 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> writes:
> > On Fri, 2026-09-25 at 09:32 +0000, PG Doc comments form wrote:
> >> I noticed, that it not documented anywhere what log_line_prefix will
> do, if
> >> log_destination = 'jsonlog' (Or CSV). From my tests it seems it is
> ignored
> >> and does nothing. But we weren't sure and would be helpful to have this
> >> documented.
>
> > True; here is a patch.
>
> This wording seems like it might add confusion rather than remove it,
> because it's not allowing for the fact that log_destination can be
> a list. I'd be inclined to write something more along the lines of
> "... string that is output at the beginning of each log line that is
> sent to stderr, syslog, or eventlog".
>
> regards, tom lane
>

I agree with Tom