Several reports are available to help you monitor the activity of your site. These reports can be accessed from the Reports link in the Administration menu then selecting the desired report.
Recent Log Messages - lists site activity including page creation and updates, module configuration, notices and warnings. Each message is stamped with the date, user, and link to more information.
Top ‘access denied’ errors - lists the pages anonymous users were restricted from viewing along with a number of times that error displayed.
Top ‘page not found’ errors - lists the URL that leads to the 404 page, indicating the page could not be found as well as the number of times this error occurred.