Metrics are becoming increasingly important for content marketing. Simply measuring visitors or users, and displaying the results in colored graphics is no longer sufficient. A CMS solves this by going to the source: the content.
Content Performance Metrics
You've probably been measuring users or page visitors on on your site or mobile app for a long time. Thanks to free systems like Google Analytics or open source analytics software like Piwik, you have a (more or less) accurate picture of the pages that your visitors or users have visited.