Autonomous transaction, background worker

Hi

I try to setup a logging facility and want it to do its work 
asynchronously in autonomous transactions. I have read 
http://blog.dalibo.com/2016/08/19/Autonoumous_transactions_support_in_PostgreSQL.html 
and chapter 47 of the documentation believing those articles are about 
the same. However, pg_background_launch mentioned in the blog is not 
available on my vanilla installation of Debian 10.3-2 from the 
PostgreSQL repositories.
CHapter 47 makes me believe I need to code some C functions to use 
background workers.

How are things actually?

Kind regards Thiemo

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