diff --git a/api/enterprise/telemetry/enterprise_trace.py b/api/enterprise/telemetry/enterprise_trace.py
index 4370ede15e..92d21b7b9a 100644
--- a/api/enterprise/telemetry/enterprise_trace.py
+++ b/api/enterprise/telemetry/enterprise_trace.py
@@ -491,15 +491,15 @@ class EnterpriseOtelTrace:
         labels = self._labels(
             tenant_id=tenant_id or "",
             app_id=app_id or "",
-            model_provider=metadata.get("ls_provider", ""),
-            model_name=metadata.get("ls_model_name", ""),
+            model_provider=metadata.get("ls_provider") or "",
+            model_name=metadata.get("ls_model_name") or "",
         )
         token_labels = TokenMetricLabels(
             tenant_id=tenant_id or "",
             app_id=app_id or "",
             operation_type=OperationType.MESSAGE,
-            model_provider=metadata.get("ls_provider", ""),
-            model_name=metadata.get("ls_model_name", ""),
+            model_provider=metadata.get("ls_provider") or "",
+            model_name=metadata.get("ls_model_name") or "",
             node_type="",
         ).to_dict()
         self._exporter.increment_counter(EnterpriseTelemetryCounter.TOKENS, info.total_tokens, token_labels)
diff --git a/api/extensions/ext_otel.py b/api/extensions/ext_otel.py
index fce5736032..f27e467801 100644
--- a/api/extensions/ext_otel.py
+++ b/api/extensions/ext_otel.py
@@ -66,12 +66,20 @@ def init_app(app: DifyApp):
             exporter = GRPCSpanExporter(
                 endpoint=endpoint,
                 # Header field names must consist of lowercase letters, check RFC7540
-                headers=((("authorization", f"Bearer {dify_config.OTLP_API_KEY}"),) if dify_config.OTLP_API_KEY else None),
+                headers=(
+                    (
+                        ("authorization", f"Bearer {dify_config.OTLP_API_KEY}"),
+                    ) if dify_config.OTLP_API_KEY else None
+                ),
                 insecure=insecure,
             )
             metric_exporter = GRPCMetricExporter(
                 endpoint=endpoint,
-                headers=((("authorization", f"Bearer {dify_config.OTLP_API_KEY}"),) if dify_config.OTLP_API_KEY else None),
+                headers=(
+                    (
+                        ("authorization", f"Bearer {dify_config.OTLP_API_KEY}"),
+                    ) if dify_config.OTLP_API_KEY else None
+                ),
                 insecure=insecure,
             )
         else:
diff --git a/api/tasks/ops_trace_task.py b/api/tasks/ops_trace_task.py
index 5b61e9e7a1..3d3a9755a5 100644
--- a/api/tasks/ops_trace_task.py
+++ b/api/tasks/ops_trace_task.py
@@ -51,7 +51,7 @@ def process_trace_tasks(file_info):
             try:
                 EnterpriseOtelTrace().trace(trace_info)
             except Exception:
-                logger.warning("Enterprise trace failed for app_id: %s", app_id, exc_info=True)
+                logger.exception("Enterprise trace failed for app_id: %s", app_id)
 
         if trace_instance:
             with current_app.app_context():
diff --git a/api/tests/unit_tests/enterprise/telemetry/test_exporter.py b/api/tests/unit_tests/enterprise/telemetry/test_exporter.py
index 8f052516e1..f207ff672b 100644
--- a/api/tests/unit_tests/enterprise/telemetry/test_exporter.py
+++ b/api/tests/unit_tests/enterprise/telemetry/test_exporter.py
@@ -142,6 +142,7 @@ def test_https_endpoint_uses_secure_grpc(mock_metric_exporter: MagicMock, mock_s
     assert mock_metric_exporter.call_args is not None
     assert mock_metric_exporter.call_args.kwargs["insecure"] is False
 
+
 @patch("enterprise.telemetry.exporter.GRPCSpanExporter")
 @patch("enterprise.telemetry.exporter.GRPCMetricExporter")
 def test_http_endpoint_uses_insecure_grpc(mock_metric_exporter: MagicMock, mock_span_exporter: MagicMock) -> None:
@@ -165,6 +166,7 @@ def test_http_endpoint_uses_insecure_grpc(mock_metric_exporter: MagicMock, mock_
     assert mock_metric_exporter.call_args is not None
     assert mock_metric_exporter.call_args.kwargs["insecure"] is True
 
+
 @patch("enterprise.telemetry.exporter.HTTPSpanExporter")
 @patch("enterprise.telemetry.exporter.HTTPMetricExporter")
 def test_insecure_not_passed_to_http_exporters(mock_metric_exporter: MagicMock, mock_span_exporter: MagicMock) -> None: