🐛(backend) acknowledge unknown LiveKit webhook events instead of 422

Around 0.76% of incoming LiveKit webhooks were being flagged as
unprocessable and returned a 422, even though LiveKit was sending
legitimate data — just with event types we do not handle. This
inflated error metrics and made real webhook issues harder to spot.

Return a 200 for these webhooks instead. When a new, unhandled
event type shows up, log a warning so we can decide whether it is
worth adding explicit handling.

CHANGELOG.md

@@ -10,13 +10,9 @@ and this project adheres to
 
 ### Fixed
 
+- 🐛(backend) acknowledge unknown LiveKit webhook events instead of 422
 - 🔒️(backend) enforce display name setting on rename API
 
-### Changed
-
-- 🔇(backend) silence expected 401 warnings on /me
-- 🔇(backend) silence noisy request summary info logs
-
 ## [1.31.0] - 2026-09-08
 
 ### Added

src/backend/core/logging_filters.py

@@ -1,25 +0,0 @@
-"""Logging filters for the core application."""
-
-import logging
-
-from django.conf import settings
-
-
-class SilenceExpected401(logging.Filter):
-    """Drop the expected 401 from anonymous hits on the /me endpoint.
-
-    The frontend probes `/users/me/` to check authentication; a 401 for
-    anonymous users is normal, not a warning worth logging.
-    """
-
-    def filter(self, record):
-        """Return False for a 401 on a silenced path, True otherwise."""
-        if getattr(record, "status_code", None) != 401:
-            return True
-
-        request = getattr(record, "request", None)
-        path = getattr(request, "path", None)
-        if not path:
-            return True
-
-        return path not in settings.LOGGING_SILENCED_401_PATHS

src/backend/core/services/livekit_events.py

@@ -52,12 +52,6 @@ class InvalidPayloadError(LiveKitWebhookError):
     status_code = 400
 
 
-class UnsupportedEventTypeError(LiveKitWebhookError):
-    """Unsupported event type."""
-
-    status_code = 422
-
-
 class ActionFailedError(LiveKitWebhookError):
     """Webhook action fails to process or complete."""
 
@@ -74,6 +68,7 @@ class LiveKitWebhookEventType(Enum):
     # Participant events
     PARTICIPANT_JOINED = "participant_joined"
     PARTICIPANT_LEFT = "participant_left"
+    PARTICIPANT_CONNECTION_ABORTED = "participant_connection_aborted"
 
     # Track events
     TRACK_PUBLISHED = "track_published"
@@ -153,10 +148,13 @@ class LiveKitEventsService:
 
         try:
             webhook_type = LiveKitWebhookEventType(data.event)
-        except ValueError as e:
-            raise UnsupportedEventTypeError(
-                f"Unknown webhook type: {data.event}"
-            ) from e
+        except ValueError:
+            logger.warning(
+                "Ignoring unknown LiveKit webhook event type '%s' for room '%s'",
+                data.event,
+                room_name,
+            )
+            return
 
         # Handle according to received webhook type
         handler = self._webhook_handlers.get(webhook_type.value)

src/backend/core/tests/rooms/test_api_rooms_webhook.py

@@ -94,7 +94,7 @@ def test_invalid_payload(client, auth_token, mock_livekit_config):
 
 
 def test_unknown_event_type(client, mock_livekit_config):
-    """Should return 422 for unknown event type."""
+    """Should acknowledge (200) an unknown event type rather than reject it."""
     event_data = json.dumps({"event": "unknown_event_type"})
 
     # Generate auth token for this specific payload
@@ -112,10 +112,8 @@ def test_unknown_event_type(client, mock_livekit_config):
         HTTP_AUTHORIZATION=auth_token,
     )
 
-    assert response.status_code == 422
-    assert response.json() == {
-        "status": "error",
-    }
+    assert response.status_code == 200
+    assert response.json() == {"status": "success"}
 
 
 @mock.patch.object(LiveKitEventsService, "_handle_room_finished")

src/backend/core/tests/services/test_livekit_events.py

@@ -16,7 +16,6 @@ from core.services.livekit_events import (
     AuthenticationError,
     InvalidPayloadError,
     LiveKitEventsService,
-    UnsupportedEventTypeError,
     api,
 )
 from core.services.lobby import LobbyService
@@ -665,22 +664,27 @@ def test_receive_missing_auth(service):
 
 
 @mock.patch.object(api.WebhookReceiver, "receive")
-def test_receive_unsupported_event(mock_receive, service):
-    """Should raise LiveKitWebhookError for unsupported events."""
+def test_receive_unknown_event_is_acknowledged(mock_receive, service, caplog):
+    """Unknown event types are logged and ignored, not rejected.
+
+    LiveKit adds event types over time and does not retry 4xx responses, so
+    raising here would silently drop the event.
+    """
     mock_request = mock.MagicMock()
     mock_request.headers = {"Authorization": "test_token"}
     mock_request.body = b"{}"
 
-    # Mock returned data with unsupported event type
     mock_data = mock.MagicMock()
     mock_data.room.name = str(uuid.uuid4())
-    mock_data.event = "unsupported_event"
+    mock_data.event = "some_future_event"
     mock_receive.return_value = mock_data
 
-    with pytest.raises(
-        UnsupportedEventTypeError, match="Unknown webhook type: unsupported_event"
-    ):
-        service.receive(mock_request)
+    with caplog.at_level("WARNING", logger="core.services.livekit_events"):
+        service.receive(mock_request)  # must not raise
+
+    assert "Ignoring unknown LiveKit webhook event type 'some_future_event'" in (
+        caplog.text
+    )
 
 
 @mock.patch.object(api.WebhookReceiver, "receive")

src/backend/meet/settings.py

@@ -1110,12 +1110,6 @@ class Base(Configuration):
         environ_prefix=None,
     )
 
-    LOGGING_SILENCED_401_PATHS = values.ListValue(
-        default=["/api/v1.0/users/me/"],
-        environ_name="LOGGING_SILENCED_401_PATHS",
-        environ_prefix=None,
-    )
-
     # Logging
     # We want to make it easy to log to console but by default we log production
     # to Sentry and don't want to log to console.
@@ -1128,16 +1122,10 @@ class Base(Configuration):
                 "style": "{",
             },
         },
-        "filters": {
-            "silence_expected_401": {
-                "()": "core.logging_filters.SilenceExpected401",
-            },
-        },
         "handlers": {
             "console": {
                 "class": "logging.StreamHandler",
                 "formatter": "simple",
-                "filters": ["silence_expected_401"],
             },
         },
         # Override root logger to send it to console
@@ -1148,13 +1136,6 @@ class Base(Configuration):
             ),
         },
         "loggers": {
-            "request.summary": {
-                "level": values.Value(
-                    "WARNING",
-                    environ_name="LOGGING_LEVEL_REQUEST_SUMMARY",
-                    environ_prefix="",
-                )
-            },
             "core": {
                 "handlers": ["console"],
                 "level": values.Value(