chore: handle lingma-agents suggestions

Author: sipercai

instrumentation-genai/opentelemetry-instrumentation-langchain/README.md

@@ -96,10 +96,10 @@ If everything is working correctly, you should see logs similar to th
 
 ## Forwarding OTLP Data to the Backend
 ```shell
-export OTEL_SERVICE_NAME= <service_name>
+export OTEL_SERVICE_NAME=<service_name>
 export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
-export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT= <trace_endpoint>
-export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT= <metrics_endpoint>
+export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=<trace_endpoint>
+export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=<metrics_endpoint>
 
 export OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT=true
 

instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/internal/_tracer.py

@@ -472,7 +472,8 @@ def _parse_message_data(message_data: Optional[Mapping[str, Any]]) -> Iterator[T
     elif message_class_name.startswith("ToolMessage"):
         role = "tool"
     elif message_class_name.startswith("ChatMessage"):
-        role = message_data["kwargs"]["role"]
+        kwargs = message_data.get("kwargs", {})
+        role = kwargs.get("role", "unknown")
     else:
         raise ValueError(f"Cannot parse message of type: {message_class_name}")
     yield MESSAGE_ROLE, role