On Monday, July 13, 2020, PG Bug reporting form <
noreply@postgresql.org> wrote:
The following bug has been logged on the website:
Bug reference: 16539
Logged by: yanliang lei
Email address: leiyanliang@highgo.com
PostgreSQL version: 12.1
Operating system: CentOS7.7
Description:
In the https://www.postgresql.org/docs/12/adminpack.html，there is a function
which name is pg_logdir_ls() ，but there is no this function name from psql
query（the following query），why？
postgres=# \df pg_ls_logdir
postgres=# \df pg_logdir*
List of functions
Schema | Name | Result data type | Argument data types | Type
--------+------+------------------+---------------------+------
(0 rows) ---->>>there is no pg_logdir* function！！！
The commentary at the end of the TOC describes how to use the stuff described in the “Additional Supplied Modules” section.
In short, you haven’t installed the function from adminpack but core provide its own version.
David J.