Add logic to include span attributes in async process

litellm/integrations/braintrust_logging.py

@@ -350,6 +350,20 @@ async def async_log_success_event(  # noqa: PLR0915
 
             # Allow metadata override for span name
             span_name = dynamic_metadata.get("span_name", "Chat Completion")
+
+            # Span parents is a special case
+            span_parents = dynamic_metadata.get("span_parents")
+
+            # Convert comma-separated string to list if present
+            if span_parents:
+                span_parents = [s.strip() for s in span_parents.split(",") if s.strip()]
+
+            # Add optional span attributes only if present
+            span_attributes = {
+                "span_id": dynamic_metadata.get("span_id"),
+                "root_span_id": dynamic_metadata.get("root_span_id"),
+                "span_parents": span_parents,
+            }
 
             request_data = {
                 "id": litellm_call_id,
@@ -359,6 +373,12 @@ async def async_log_success_event(  # noqa: PLR0915
                 "tags": tags,
                 "span_attributes": {"name": span_name, "type": "llm"},
             }
+
+            # Only add those that are not None (or falsy)
+            for key, value in span_attributes.items():
+                if value:
+                    request_data[key] = value
+
             if choices is not None:
                 request_data["output"] = [choice.dict() for choice in choices]
             else:

tests/test_litellm/integrations/test_braintrust_span_name.py

@@ -294,6 +294,76 @@ def test_span_attributes_with_multiple_metadata_fields(self, MockHTTPHandler):
         self.assertEqual(event_metadata['user_id'], 'user123')
         self.assertEqual(event_metadata['session_id'], 'session456')
 
+    @patch("litellm.integrations.braintrust_logging.get_async_httpx_client")
+    async def test_async_span_attributes_with_multiple_metadata_fields(self, mock_get_http_handler):
+        """Test async logging with custom span name."""
+        # Mock async HTTP response
+        mock_http_handler = MagicMock()
+        mock_http_handler.post = MagicMock(return_value=Mock())
+        mock_get_http_handler.return_value = mock_http_handler
+
+        # Setup
+        logger = BraintrustLogger(api_key="test-key")
+        logger.default_project_id = "test-project-id"
+
+        # Create a properly structured mock response
+        response_obj = litellm.ModelResponse(
+            id="test-id",
+            object="chat.completion",
+            created=1234567890,
+            model="gpt-3.5-turbo",
+            choices=[
+                {
+                    "index": 0,
+                    "message": {"role": "assistant", "content": "test response"},
+                    "finish_reason": "stop",
+                }
+            ],
+            usage={"prompt_tokens": 10, "completion_tokens": 20, "total_tokens": 30},
+        )
+
+        kwargs = {
+            "litellm_call_id": "test-call-id",
+            "messages": [{"role": "user", "content": "test"}],
+            "litellm_params": {
+                "metadata": {
+                    "span_name": "Async Custom Operation",
+                    "span_id": "span_id",
+                    "root_span_id": "root_span_id",
+                    "span_parents": "span_parent1,span_parent2",
+                    "project_id": "custom-project",
+                    "user_id": "user123",
+                    "session_id": "session456"
+                }
+            },
+            "model": "gpt-3.5-turbo",
+            "response_cost": 0.001,
+        }
+
+        # Execute
+        await logger.async_log_success_event(
+            kwargs, response_obj, datetime.now(), datetime.now()
+        )
+
+        # Verify
+        call_args = mock_http_handler.post.call_args
+        self.assertIsNotNone(call_args)
+        json_data = call_args.kwargs["json"]
+        self.assertEqual(
+            json_data["events"][0]["span_attributes"]["name"], "Async Custom Operation"
+        )
+        # Check span name
+        self.assertEqual(json_data['events'][0]['span_attributes']['name'], 'Multi Metadata Test')
+        self.assertEqual(json_data['events'][0]['span_id'], 'span_id')
+        self.assertEqual(json_data['events'][0]['root_span_id'], 'root_span_id')
+        self.assertEqual(json_data['events'][0]['span_parents'][0], 'span_parent1')
+        self.assertEqual(json_data['events'][0]['span_parents'][1], 'span_parent2')
+
+        # Check that other metadata is preserved
+        event_metadata = json_data['events'][0]['metadata']
+        self.assertEqual(event_metadata['user_id'], 'user123')
+        self.assertEqual(event_metadata['session_id'], 'session456')
+
 
 if __name__ == "__main__":
     unittest.main()