messages sent to root logins

[Todd C. Miller]

This is just a function of how your syslog.conf is setup.  Sudo logs
to the "alert" level when someone tries to run a command they are
not allowed to run.  You probably have something like this in your
syslog.conf:

# Root gets alert and higher messages.
*.alert							root

You can change that to:
*.alert;local2.none					root

And root logins won't get blatted with sudo messages.  That assumes
sudo is set to log to "local2", which is its default.  Alternately,
you could just comment out the root line entirely if you never want
syslog to blat to root logins.

 - todd