LangSmith Introducing End-to-End OpenTelemetry Support in LangSmith

On 26 March 2025 the LangChain team announced that LangSmith now offers full end‑to‑end OpenTelemetry (OTel) support, enabling developers to standardize tracing across their LangChain or LangGraph applications and send traces to LangSmith or other observability platforms. The update adds a pip install option "langsmith[otel]" and an environment variable LANGSMITH_OTEL_ENABLED that activates the integration, allowing automatic trace generation from LangChain components. Traces are converted to the OTel format by the LangSmith SDK and ingested by the platform, where they can be visualized alongside existing LLM‑specific dashboards. The integration supports distributed tracing across microservices, context propagation, and interoperability with Datadog, Grafana, and Jaeger. While the OTel pipeline offers maximum flexibility, it incurs slightly higher overhead compared to LangSmith’s native tracing format, which is optimized for LLM workloads. The release also highlights that native LangSmith tracing remains the recommended option for users who rely solely on LangSmith for observability. Developers can start using the feature by installing the otel extras, setting LANGSMITH_OTEL_ENABLED=true, and running a LangChain chain to verify that traces appear in the LangSmith dashboard.