You can develop a app to get report about user activities(Admin/Docs/Login).
It have been replaced by the Admin SDK’s Reports API
The Reports API lets you customize usage reports across your whole account, for example, the number of logins in the past 30 days. And the API's activity reports let you understand user activities in specific Google Apps services such as the Admin console and Google Docs and Drive.
admin.google.com: when you create a business account, you can login in successfully.
Follow the step , go to next.