Finally yesterday I got server statics working. First I did upgraded my Zimbra version which was in 5.0.18 to the current one 6.0.5. Then I realized the logger service was not running and that it was a problem that I did not have a stat log file for which the location was
/var/log/zimbra-stats.log
Now snooping around to find out what script might be there that might create this file I found /opt/zimbra/bin/zmsyslogsetup
I ran this script and after about 5 hrs or so I started getting my graphs working
