The resolution is to re-create the SSH key and updating; restart ZCS and then as root run
Code:
/opt/zimbra/bin/zmsyslogsetup
Once that was done switch to the zimbra user and execute
Code:
/opt/zimbra/libexec/zmstatuslog
and check that /var/log/zimbra.log is being updated
Code:
grep "STATUS" /var/log/zimbra-stats.log | grep stats | head -n10
Refresh your browser, and voila !
it working