Description:
Since salt minion can quite easily log megabytes of data when master is unavailable I suggest to add logrotate configuration into salt package. Please note that Debian package salt-common also has such file included.

Suggested contents of /etc/logrotate.d/salt:

/var/log/salt/master /var/log/salt/minion {
compress
rotate 5
size 1024k
notifempty
missingok
copytruncate
}