Fix small audio events details (#6978)

* Fix missed audio details

* Add mqtt docs

* Delete instead of setting to None

docs/docs/configuration/index.md

@@ -467,10 +467,11 @@ cameras:
         # Required: the path to the stream
         # NOTE: path may include environment variables, which must begin with 'FRIGATE_' and be referenced in {}
         - path: rtsp://viewer:{FRIGATE_RTSP_PASSWORD}@10.0.10.10:554/cam/realmonitor?channel=1&subtype=2
-          # Required: list of roles for this stream. valid values are: detect,record,rtmp
-          # NOTICE: In addition to assigning the record and rtmp roles,
+          # Required: list of roles for this stream. valid values are: audio,detect,record,rtmp
+          # NOTICE: In addition to assigning the audio, record, and rtmp roles,
           # they must also be enabled in the camera config.
           roles:
+            - audio
             - detect
             - record
             - rtmp

docs/docs/integrations/mqtt.md

@@ -109,11 +109,19 @@ Same data available at `/api/stats` published at a configurable interval.
 
 ### `frigate/<camera_name>/detect/set`
 
-Topic to turn detection for a camera on and off. Expected values are `ON` and `OFF`.
+Topic to turn object detection for a camera on and off. Expected values are `ON` and `OFF`.
 
 ### `frigate/<camera_name>/detect/state`
 
-Topic with current state of detection for a camera. Published values are `ON` and `OFF`.
+Topic with current state of object detection for a camera. Published values are `ON` and `OFF`.
+
+### `frigate/<camera_name>/audio/set`
+
+Topic to turn audio detection for a camera on and off. Expected values are `ON` and `OFF`.
+
+### `frigate/<camera_name>/audio/state`
+
+Topic with current state of audio detection for a camera. Published values are `ON` and `OFF`.
 
 ### `frigate/<camera_name>/recordings/set`
 

frigate/comms/mqtt.py

@@ -149,6 +149,7 @@ class MqttClient(Communicator):  # type: ignore[misc]
             "recordings",
             "snapshots",
             "detect",
+            "audio",
             "motion",
             "improve_contrast",
             "motion_threshold",

frigate/events/audio.py

@@ -206,7 +206,7 @@ class AudioEventMaintainer(threading.Thread):
                 now - detection.get("last_detection", now)
                 > self.config.audio.max_not_heard
             ):
-                self.detections[detection["label"]] = None
+                del self.detections[detection["label"]]
                 requests.put(
                     f"{FRIGATE_LOCALHOST}/api/events/{detection['id']}/end",
                     json={