Rudder

It would be could to know at a glance some info / stat about Rudder elements, for example in the home page:

• number of Groups (and number of active groups, number of groups used in a Rule)
• number of Directive (and number of active directive, and number of directive used in Rule, and min/mean/max number of Directive for a Rule)
• number of nodes (active, with rules, pending)
• and perhaps some information about reports.