Improve logging for unregistered webhooks (#34882)

* Improve logging for unregistered webhooks

* Address comment, KEY_REAL_IP

* Address comment, read(64)

* Lint

homeassistant/components/webhook/__init__.py

@@ -7,6 +7,7 @@ import voluptuous as vol
 
 from homeassistant.components import websocket_api
 from homeassistant.components.http.view import HomeAssistantView
+from homeassistant.components.http.const import KEY_REAL_IP
 from homeassistant.const import HTTP_OK
 from homeassistant.core import callback
 from homeassistant.loader import bind_hass
@@ -71,7 +72,14 @@ async def async_handle_webhook(hass, webhook_id, request):
 
     # Always respond successfully to not give away if a hook exists or not.
     if webhook is None:
-        _LOGGER.warning("Received message for unregistered webhook %s", webhook_id)
+        peer_ip = request[KEY_REAL_IP]
+        _LOGGER.warning(
+            "Received message for unregistered webhook %s from %s", webhook_id, peer_ip
+        )
+        # Look at content to provide some context for received webhook
+        # Limit to 64 chars to avoid flooding the log
+        content = await request.content.read(64)
+        _LOGGER.debug("%s...", content)
         return Response(status=HTTP_OK)
 
     try: