2 Commits

Author	SHA1	Message	Date
Dayuan Jiang	9d9613a8d1	feat: add trace-level input/output to Langfuse observability (#69) ... * feat: add trace-level input/output to Langfuse observability - Add @langfuse/client and @langfuse/tracing dependencies - Wrap POST handler with observe() for proper tracing - Use updateActiveTrace() to set trace input, output, sessionId, userId - Filter Next.js HTTP spans in shouldExportSpan so AI SDK spans become root traces - Enable recordInputs/recordOutputs in experimental_telemetry * refactor: extract Langfuse logic to separate lib/langfuse.ts module	2025-12-04 11:24:26 +09:00
Dayuan Jiang	fa1b02ad78	feat: integrate Langfuse for LLM observability (#66) ... * feat: integrate Langfuse for LLM observability - Add instrumentation.ts with Langfuse OpenTelemetry exporter - Enable experimental telemetry on streamText calls - Add instrumentationHook to Next.js config - Install required dependencies (@vercel/otel, langfuse-vercel, etc.) * feat: add optional Langfuse observability integration - Add session tracking with unique sessionId per conversation - Add user tracking via IP address (x-forwarded-for header) - Make telemetry conditional - only enabled if LANGFUSE_PUBLIC_KEY is set - Add environment variable validation in instrumentation.ts - Add sessionId validation (type check + 200 char limit) - Update env.example with Langfuse configuration docs - Remove unused langfuse-vercel and @vercel/otel packages * fix: remove deprecated instrumentationHook (enabled by default in Next.js 15)	2025-12-04 00:23:09 +09:00