feat: restore Langfuse observability integration #103
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- Add lib/langfuse.ts with client, trace input/output, telemetry config - Add instrumentation.ts for OpenTelemetry setup with Langfuse span processor - Add /api/log-save endpoint for logging diagram saves - Add /api/log-feedback endpoint for thumbs up/down feedback - Update chat route with sessionId tracking and telemetry - Add feedback buttons (thumbs up/down) to chat messages - Add sessionId tracking throughout the app - Update env.example with Langfuse configuration - Add @langfuse/client, @langfuse/otel, @langfuse/tracing, @opentelemetry/sdk-trace-node
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Summary
Changes
New Files
lib/langfuse.ts- Langfuse client utilitiesinstrumentation.ts- OpenTelemetry setup with Langfuse span processorapp/api/log-save/route.ts- API for logging diagram savesapp/api/log-feedback/route.ts- API for user feedback (thumbs up/down)Updated Files
app/api/chat/route.ts- Added sessionId tracking and telemetrycomponents/chat-message-display.tsx- Added feedback buttonscomponents/chat-panel.tsx- Added sessionId state managementcomponents/chat-input.tsx- Pass sessionId to save functioncontexts/diagram-context.tsx- Log saves to Langfuseenv.example- Added Langfuse config documentationpackage.json- Added @langfuse/*, @opentelemetry dependenciesTest Plan
/api/log-feedbackreturns 200 OK/api/log-savereturns 200 OK