I would like to able to gather the following information for tracking purposes:

• total number of users logged in
• total pages changed in the last 5 minutes, 2 hours, 4 hours, days
• durration of visit (if possible)
• size of spaces (in terms of # pages, bytes size, attachment size)
• page hits (with the ability to ignore search engines)

This is only a small list as I'm sure there are many more metrics that could be gathered.