Most Drupal enterprise-class applications and web sites have business-specific quantities to measure: the Munin API plugin offers a very simple way to write your own plugin, to monitor exactly the quantities needed for your marketing or quality purposes.
You can even choose which statistics will be made available to which audience: marketing is likely more interested in tracking the new users subscription rate, while systems may care more for the database fragmentation level. Both of these can be monitored and displayed separately: code this in-house or Contact OSInet for a quote on custom plugin development.
