Noted that we have some fairly large proftpd log files:
(omitted per IP byte logs as they appear to be rotated)
Further investigation showed that the logrotate def was broken/ineffectual:
I would think that the logorate def is broken and should actually refer to /var/log/proftpd/*.log /var/log/proftpd/xferlog.legacy. Please confirm whether this is a bug and the preferred solution. We would like to rotate these logs before they get too much bigger. 
Note, also, that it would be much more elegant if DA was configured to have proftpd output all logs to be rotated with logrotate with a .log extension, as then a single wildcard could be used.
Regards,
-the donco
Code:
# ll /var/log/proftpd/
-rw-r--r-- 1 root root 56596483 Aug 7 22:45 access.log
-rw-r--r-- 1 root root 31974855 Aug 7 22:45 auth.log
-rw-r--r-- 1 root root 57130081 Aug 7 22:45 xferlog.legacy
Further investigation showed that the logrotate def was broken/ineffectual:
Code:
# cat /etc/logrotate.d/proftpd
/var/log/xferlog {
missingok
notifempty
postrotate
/usr/bin/kill -HUP `cat /var/run/proftpd.pid 2>/dev/null` 2>/dev/null || true
endscript
}

Note, also, that it would be much more elegant if DA was configured to have proftpd output all logs to be rotated with logrotate with a .log extension, as then a single wildcard could be used.
Regards,
-the donco