There is a less-talked-about improvement in PostgreSQL 12 which can greatly reduce the benign log entries. postgresql.org. Background In PostgreSQL, for each client connection request to Postmaster (listens on port 5432 by default), a backend process will be created. It then processes the startup packet from the client. Refer to [crayon-5de7290104d00116988722-i/] for the source code. [&]

https://www.percona.com/blog/2019/12/03/postgresql-12-improvement-benign-log-entries-incomplete-startup-packet/