Re: Logging pg_autovacuum

"Larry Rosenman" <lrosenman@pervasive.com> writes:
> I'd like to see a more concrete definition of what we 
> want Autovacuum to output and at what levels. 

I would argue that what people typically want is
(0)    nothing
(1)    per-database log messages

or
(2)    per-table log messages (including per-database)

The first problem is that (2) is only available at DEBUG2 or below,
which is not good because that also clutters the log with a whole lot of
implementer-level debugging info.

The second problem is that we don't really want to use the global
log_min_messages setting to determine this, because that constrains
your decision about how much chatter you want from ordinary backends.

I suggest that maybe the cleanest solution is to not use log level at
all for this, but to invent a separate "autovacuum_verbosity" setting
that controls how many messages autovac tries to log, using the above
scale.  Anything it does try to log can just come out at LOG message
setting.
        regards, tom lane