Improve Notifications (#16453)

* backend

* frontend

* add notification config at camera level

* camera level notifications in dispatcher

* initial onconnect

* frontend

* backend for suspended notifications

* frontend

* use base communicator

* initialize all cameras in suspended array and use 0 for unsuspended

* remove switch and use select for suspending in frontend

* use timestamp instead of datetime

* frontend tweaks

* mqtt docs

* fix button width

* use grid for layout

* use thread and queue for processing notifications with 10s timeout

* clean up

* move async code to main class

* tweaks

* docs

* remove warning message

frigate/app.py

@@ -17,8 +17,9 @@ import frigate.util as util
 from frigate.api.auth import hash_password
 from frigate.api.fastapi_app import create_fastapi_app
 from frigate.camera import CameraMetrics, PTZMetrics
+from frigate.comms.base_communicator import Communicator
 from frigate.comms.config_updater import ConfigPublisher
-from frigate.comms.dispatcher import Communicator, Dispatcher
+from frigate.comms.dispatcher import Dispatcher
 from frigate.comms.event_metadata_updater import (
     EventMetadataPublisher,
     EventMetadataTypeEnum,
@@ -314,8 +315,14 @@ class FrigateApp:
         if self.config.mqtt.enabled:
             comms.append(MqttClient(self.config))
 
-        if self.config.notifications.enabled_in_config:
-            comms.append(WebPushClient(self.config))
+        notification_cameras = [
+            c
+            for c in self.config.cameras.values()
+            if c.enabled and c.notifications.enabled_in_config
+        ]
+
+        if notification_cameras:
+            comms.append(WebPushClient(self.config, self.stop_event))
 
         comms.append(WebSocketClient(self.config))
         comms.append(self.inter_process_communicator)