fix: use standard gen_ai.conversation.id instead of microsoft.sessiomid in LangChain tracer

[hectorhdzg]

Replace the A365-specific 'microsoft.session.id' attribute with the standard OTel GenAI semantic convention 'gen_ai.conversation.id' in the generic LangChain tracer. This ensures Azure Monitor and OTLP users get standard attributes without any A365-specific coupling.

Changes:

• _utils.py: metadata() and extract_session_info() now yield gen_ai.conversation.id instead of microsoft.session.id. Removed duplicate SESSION_ID_KEY constant and the redundant second yield in extract_session_info.
• _span_enricher.py: New A365 span enricher for LangChain that maps gen_ai.conversation.id -> microsoft.session.id, and passes through input/output messages and tool args for invoke_agent/execute_tool spans.
• _tracer_instrumentor.py: Registers the LangChain span enricher with the A365 enriching pipeline (same pattern as SemanticKernel and AgentFramework instrumentors).
• Tests updated for the attribute key change plus 8 new enricher tests.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR standardizes LangChain tracing attributes by emitting the OTel GenAI semantic convention gen_ai.conversation.id from the generic tracer, while adding an A365-specific span enricher to map that value back to microsoft.session.id when exporting through the A365 pipeline.

Changes:

• Update LangChain utils to yield gen_ai.conversation.id (and remove duplicate/extra session-id yields).
• Add and register an A365 LangChain span enricher that maps gen_ai.conversation.id → microsoft.session.id (and passes through select GenAI attributes).
• Update tests for the attribute key change and add new enricher tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tests/langchain/test_utils.py	Updates expectations to assert gen_ai.conversation.id instead of microsoft.session.id.
tests/langchain/test_span_enricher.py	Adds unit tests for the new LangChain A365 span enricher behavior.
src/microsoft/opentelemetry/_genai/_langchain/_utils.py	Emits GEN_AI_CONVERSATION_ID_KEY and removes the old SESSION_ID_KEY constant/duplicate yield.
src/microsoft/opentelemetry/_genai/_langchain/_tracer_instrumentor.py	Registers/unregisters the LangChain A365 span enricher when the A365 pipeline is available.
src/microsoft/opentelemetry/_genai/_langchain/_span_enricher.py	Introduces LangChain A365 span enricher mapping and selective attribute passthrough.

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