We upgraded this past Friday as well. Everything seems to be fine, but we did notice one strange issue.
Apparently in our case, the zimbra upgrade script didn't update some of the logrotate user:group ownerships in /etc/logrotate.d/zimbra.
See here...
/var/log/zimbra.log {
daily
missingok
notifempty
create 0644 USER GROUP
postrotate
killall -HUP syslogd 2> /dev/null || true
su - zimbra -c "/opt/zimbra/bin/zmswatchctl restart" > /dev/null 2>&1 || true
endscript
compress
}
/var/log/zimbra-stats.log {
daily
missingok
notifempty
create 0644 USER GROUP
postrotate
killall -HUP syslogd 2> /dev/null || true
su - zimbra -c "/opt/zimbra/bin/zmlogswatchctl restart" > /dev/null 2>&1 || true
endscript
rotate 0
}