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feat(langchain): add model, chain, agent, and streaming callback handlers [4/5]#4453

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nagkumar91 wants to merge 4 commits intoopen-telemetry:mainfrom
nagkumar91:langchain/pr4-callback-handler-core
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feat(langchain): add model, chain, agent, and streaming callback handlers [4/5]#4453
nagkumar91 wants to merge 4 commits intoopen-telemetry:mainfrom
nagkumar91:langchain/pr4-callback-handler-core

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Commits on Apr 16, 2026