On the Notification tab, you can view event notifications, call logs of video intercom devices, and alarm information related to security control panels.
In the mobile client, each device can only send one alarm per minute. It's a mechanism to not overload the servers. So for example, a camera will send a notification about a line crossing but if someone crosses the same line 20 seconds later on the same camera, it won't send another alert/notification. It can only send 1 alert per device, per minute.