Add a basic usage counter for enterprise

endpoints/api/superuser.py

@@ -52,6 +52,25 @@ def user_view(user):
     'super_user': user.username in app.config['SUPER_USERS']
   }
 
+@resource('/v1/superuser/usage/')
+@internal_only
+@show_if(features.SUPER_USERS)
+class UsageInformation(ApiResource):
+  """ Resource for returning the usage information for enterprise customers. """
+  @require_fresh_login
+  @nickname('getSystemUsage')
+  def get(self):
+    """ Returns the number of repository handles currently held. """
+    if SuperUserPermission().can():
+      return {
+        'usage': model.get_repository_usage(),
+        'allowed': 0
+      }
+
+    abort(403)
+
+
+
 @resource('/v1/superuser/users/')
 @internal_only
 @show_if(features.SUPER_USERS)