Make sure we check the instance list in the activity stream middleware so we aren't causing a storm of update events trying to attach the request user

awx/main/middleware.py

@@ -44,6 +44,7 @@ class ActivityStreamMiddleware(object):
                 if isinstance(user, User) and instance.user is None:
                     instance.user = user
                 else:
+                    if instance not in self.instances:
                         self.isActivityStreamEvent = True
                         self.instances.append(instance)
             else: