Google Analytics service helps to monitor website which provide data about your web site activities including traffic, number of visitors, and duration of the time left on your website, It provides user friendly interface with graph.
you may get more information here: http://googleenterprise.blogspot.in/2010/12/now-available-with-google-apps-google_07.html
By default Analytic service is disabled for all the Google apps account, for enabling it is necessary to have admin account.
Once you enable the service, it can be personally assign a particular email ID for handle a role which is either readwrite or readonly.
1, Login to the with admin of your google apps account. Goto settings –> manage domain.
2. Select more google apps by clicking More controls
< Here you will see that Google Analystics is OFF >
4, Select and turned it on
Now the Google Analytics service is available for all the google app account holders.