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fa1b02ad78
* 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)