RRD tool can used for drawing graphs by fetching the statics from DB servers and plotting graphs store it an image file and embedded it on the HTML page to look it nice .
Thanks for these links. I am trying out the muninpgplugins but I get "Global symbol "$statscope" requires explicit package name at /etc/munin/plugins//pg_exilog_stat_database line 179". Execution of /etc/munin/plugins/pg_exilog_stat_database aborted due to compilation errors.
I have the following in /etc/munin/plugin-conf.d/munin-node