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langchain-observability

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# LangChain Observability (Python)

## Overview

[Credential-related source omitted]
0.2 docs, restarts the service, and sees zero traces in LangSmith — no errors,
no warnings. That is P26: in LangChain 1.0 the canonical env vars are
`LANGSMITH_TRACING` and `LANGSMITH_API_KEY`. The `LANGCHAIN_*` names are
soft-deprecated and fail silently on any chain that goes through 1.0 middleware
or `create_react_agent`. One-line fix:

```bash
export LANGSMITH_TRACING=true
[Credential-related source omitted]
export LANGSMITH_PROJECT=my-service-prod
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