feat(langchain) GenAI semconv compliance#3822

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max-deygin-traceloop wants to merge 7 commits intomax/tlp-1925-python-sdk-otel-semantic-conventionfrom

max/tlp-1927-langchain-instrumentation

Commits on Mar 19, 2026

fix(semconv): migrating span attributes to OTel gen_ai convention (#3809)

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Commits on Mar 22, 2026

feat(langchain): use upstream gen_ai constants directly, rename LLM_ → GEN_AI_

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fix: remove duplicate GEN_AI_OPERATION_NAME set and migrate tool definitions to JSON array

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fix: migrate LangChain to gen_ai.input/output.messages JSON array format

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fix(langchain): align vendor names with GenAISystem semconv values, remove debug print

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fix(langchain): fix Google vendor value, lowercase 'langchain' fallback, add vendor unit tests

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chore(langchain): update semconv dep to >=0.5.0,<0.6.0

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