application_name parameter

On Tuesday, September 15, 2020, PG Doc comments form <noreply@postgresql.org>
wrote:

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/12/runtime-config-logging.html
Description:

Hi!

In section "19.8.3. What to Log" appears "application name (string)"
parameter which is not in the postgresql.conf configuration file.

Is it a mistake, or am I confused?

Its doesn’t make sense to set that at the server level so why should it
appear in postgres.comf?

David J.