If you have a programm that is constantly writing to /var/log/daemon.log you can prevent it like this.

Example of log message:

Mar  4 13:23:54 serverhostname annoyingprogramm[596417]: 2022/03/04 13:23:54 Found connection for client 

Make a new file in /etc/rsyslog.d/annoyingprogramm.conf containing this:

:programname, contains, "annoyingprogramm" stop

Restart rsyslog

systemctl restart rsyslog.service

• Debian 11
• Programm written in go

• Shorewall custom logging

• https://www.rsyslog.com/doc/v8-stable/configuration/properties.html