Ok,

This is for people using avahi-daemon and logcheck. I had so much cruft being sent. It looked like this...

System Events
=-=-=-=-=-=-=
Apr  4 17:05:51 servername avahi-daemon[845]: Invalid query packet.
Apr  4 17:06:51 servername avahi-daemon[845]: last message repeated 2 times
Apr  4 17:11:17 servername avahi-daemon[845]: Invalid query packet.
Apr  4 17:12:21 servername avahi-daemon[845]: last message repeated 2 times
Apr  4 17:13:21 servername avahi-daemon[845]: last message repeated 3 times
Apr  4 17:17:51 servername avahi-daemon[845]: Invalid query packet.
Apr  4 17:18:51 servername avahi-daemon[845]: last message repeated 5 times
Apr  4 17:19:51 servername avahi-daemon[845]: last message repeated 3 times
Apr  4 17:27:02 servername avahi-daemon[845]: Invalid legacy unicast query packet.

.... and on and on and on....

Here is how to silence this.

Create the file avahi-daemon in /etc/logcheck/ignore.d.server/

Add the following 2 lines

\w{3} [ :0-9]{11} [._[:alnum:]-]+ avahi-daemon\[[0-9]+\]: Invalid query packet.$

\w{3} [ :0-9]{11} [._[:alnum:]-]+ avahi-daemon\[[0-9]+\]: last message repeated [[:digit:]] times$

Save and quit

chown root.logcheck /etc/logcheck/ignore.d.server/avahi-daemon

chmod u=rwx,g=r,o=r /etc/logcheck/ignore.d.server/avahi-daemon

You should be good.

Cheers!