fix: drop expected websocket keepalive timeout Sentry noise (baserow#5225)

Asyncio logs these handled disconnects when websocket clients vanish without a close handshake, which floods Sentry without indicating an application error.

Author: silvestrid

backend/src/baserow/config/settings/base.py

@@ -1435,6 +1435,10 @@ def __setitem__(self, key, value):
     from sentry_sdk.integrations.django import DjangoIntegration
     from sentry_sdk.scrubber import DEFAULT_DENYLIST, EventScrubber
 
+    from baserow.core.sentry import (
+        drop_expected_asyncio_websocket_ping_timeout_events,
+    )
+
     # Exclude integrations whose module-level imports are incompatible:
     # - pydantic_ai: sentry-sdk patches ToolManager._call_tool which was
     #   removed in pydantic-ai >= 1.x (now execute_tool_call)
@@ -1451,6 +1455,7 @@ def __setitem__(self, key, value):
         dsn=SENTRY_DSN,
         integrations=[DjangoIntegration(signals_spans=False, middleware_spans=False)],
         send_default_pii=False,
+        before_send=drop_expected_asyncio_websocket_ping_timeout_events,
         event_scrubber=EventScrubber(recursive=True, denylist=SENTRY_DENYLIST),
         environment=os.getenv("SENTRY_ENVIRONMENT", ""),
     )

backend/src/baserow/core/sentry.py

@@ -1,6 +1,37 @@
+import logging
+from typing import Any
+
 from django.contrib.auth import get_user_model
 
 
+def drop_expected_asyncio_websocket_ping_timeout_events(
+    event: dict[str, Any], hint: dict[str, Any]
+) -> dict[str, Any] | None:
+    """
+    Ignore websocket keepalive timeouts logged by asyncio.
+
+    These are emitted by the websockets stack when a client disappears without a
+    clean close handshake. They are noisy, expected in production, and don't
+    point to an application error in Baserow itself.
+    """
+
+    log_record = hint.get("log_record")
+    if not isinstance(log_record, logging.LogRecord):
+        return event
+
+    if log_record.name != "asyncio":
+        return event
+
+    message = log_record.getMessage()
+    if (
+        "ConnectionClosedError exception in shielded future" in message
+        and "keepalive ping timeout" in message
+    ):
+        return None
+
+    return event
+
+
 def setup_user_in_sentry(user):
     """
     This function sets the user in the Sentry context. This is useful for debugging

backend/tests/baserow/core/test_sentry.py

@@ -0,0 +1,46 @@
+import logging
+
+from baserow.core.sentry import drop_expected_asyncio_websocket_ping_timeout_events
+
+
+def test_drop_expected_asyncio_websocket_ping_timeout_events():
+    event = {"logger": "asyncio"}
+    record = logging.makeLogRecord(
+        {
+            "name": "asyncio",
+            "levelno": logging.ERROR,
+            "levelname": "ERROR",
+            "msg": (
+                "ConnectionClosedError exception in shielded future future: "
+                "<Future finished exception=ConnectionClosedError(None, "
+                "Close(code=<CloseCode.INTERNAL_ERROR: 1011>, reason='keepalive "
+                "ping timeout'), None)>"
+            ),
+        }
+    )
+
+    assert (
+        drop_expected_asyncio_websocket_ping_timeout_events(
+            event, {"log_record": record}
+        )
+        is None
+    )
+
+
+def test_drop_expected_asyncio_websocket_ping_timeout_events_keeps_other_errors():
+    event = {"logger": "asyncio"}
+    record = logging.makeLogRecord(
+        {
+            "name": "asyncio",
+            "levelno": logging.ERROR,
+            "levelname": "ERROR",
+            "msg": "Task exception was never retrieved",
+        }
+    )
+
+    assert (
+        drop_expected_asyncio_websocket_ping_timeout_events(
+            event, {"log_record": record}
+        )
+        == event
+    )

changelog/entries/unreleased/bug/5224_suppress_expected_websocket_keepalive_timeout_sentry_noise.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Prevent expected websocket keepalive timeout logs from being reported to Sentry.",
+    "issue_origin": "github",
+    "issue_number": 5224,
+    "domain": "core",
+    "bullet_points": [],
+    "created_at": "2026-04-17"
+}