feat(langchain): add provider inference, message formatting, and W3C propagation utilities [2/5]#4451
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…nt recording modules Add foundation modules for enhanced LangChain GenAI semantic convention tracing: - semconv_attributes.py: Per-operation attribute matrix based on OTel GenAI semantic conventions. Single source of truth for which attributes apply to which operations (chat, text_completion, invoke_agent, execute_tool, invoke_workflow, retrieval). - operation_mapping.py: Callback-to-semconv operation mapping. Maps each LangChain callback to the correct GenAI semantic convention operation name. Includes heuristic classification for on_chain_start callbacks (agents vs workflows vs internal plumbing) and LangGraph marker recognition. - content_recording.py: Thin integration layer over the shared genai content capture utilities. Provides clear APIs for the callback handler to decide what content should be recorded on spans and events. Part 1 of a series breaking down open-telemetry#4389 into smaller reviewable PRs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…propagation utilities Add utility modules for the LangChain instrumentor: - utils.py: Provider name inference from LangChain callback data (ls_provider, base_url, class name, endpoint fields), server address/port extraction, and W3C trace context header extraction and propagation support. - message_formatting.py: Message, tool, and document serialization with content-redaction support. Converts LangChain message objects into the compact JSON format expected by OpenTelemetry GenAI semantic conventions. Part 2 of a series breaking down open-telemetry#4389 into smaller reviewable PRs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This was referenced Apr 16, 2026
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Description
Add utility modules for the LangChain instrumentor that handle provider inference, message serialization, and W3C trace context propagation.
New Modules
utils.pyls_providermetadata hint, base URL patterns, class name matching, and endpoint field analysismessage_formatting.pygen_ai.input_messages,gen_ai.output_messages,gen_ai.system_instructions,gen_ai.tool_definitions)record_content=False, text content, tool arguments, and results are replaced with"[redacted]"Tests
test_utils.py— provider inference for Azure, OpenAI, Bedrock, Anthropic, Google; server address/port extraction; trace header extractiontest_w3c_propagation.py— W3C context propagation, nested header lookup, edge casesPR Series
This is PR 2 of 5 breaking down #4389:
Depends on: #4450 (merge first)
Type of change
Checklist