feat(chat): migrate Langfuse tracing to OTEL + add user feedback#18
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- Add instrumentation.ts: NodeTracerProvider + LangfuseSpanProcessor - Rewrite api/chat/route.ts: observe() wrapper, propagateAttributes(), experimental_telemetry, getActiveTraceId() injected into messageMetadata - Remove manual sendChatTrace() HTTP calls from lib/langfuse.ts - Add postFeedbackScore() using POST /api/public/scores (not batch ingestion) - Add /api/chat/feedback proxy route (secret key server-side) - Add FeedbackAdapter to useChatRuntime, reads traceId from message metadata - Add ActionBarPrimitive.FeedbackPositive/Negative buttons to AssistantActionBar - Install: @opentelemetry/sdk-trace-node, @opentelemetry/api, langfuse Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Add 👍👎 feedback buttons to assistant action bar (hover to reveal) - Track promptVersion and messageCount in Langfuse trace metadata - Set service.name from VERCEL_ENV for environment-aware traces - Fix action bar visibility: remove -mb-7.5 clip, use autohideFloat="always" - Add @opentelemetry/resources for resourceFromAttributes (v2 API) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…lity section Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
promptVersion,messageCount,service.name(VERCEL_ENV) in traces-mb-7.5clip issue exposed by autohideFloat)langfuse-otel-tracing.mdlearnings docWhat changed
instrumentation.tsNodeTracerProvider+LangfuseSpanProcessor+resourceFromAttributesapp/api/chat/route.tsobserve()+propagateAttributes()+experimental_telemetry, injectstraceIdintomessageMetadatalib/langfuse.tssendChatTrace(), addedpostFeedbackScore()app/api/chat/feedback/route.tscomponents/chat/chat-runtime.tsxFeedbackAdapterreadstraceIdfrom message metadata, POSTs to feedback routecomponents/assistant-ui/thread.tsxautohideFloat="always"+group-hoverCSS, removed-mb-7.5Test plan
promptVersion,messageCount,service.nameappear in trace metadataPOST /api/chat/feedback204user-feedbackscore (1 or 0) appears under Scores tab🤖 Generated with Claude Code