Langfuse Reference Architecture Overview Production-grade architecture patterns for Langfuse LLM observability: singleton SDK, context propagation with , cross-service trace correlation, multi-environment configurations, and scale strategies. Prerequisites - Understanding of distributed systems and async patterns - Node.js 18+ with OpenTelemetry SDK - For v4+: , , Architecture Tiers | Tier | Scale | Architecture | Langfuse Host | |------|-------|-------------|---------------| | Starter | < 100K traces/day | Direct SDK, Cloud | Langfuse Cloud | | Growth | 100K-1M traces/day | Singleton + batch…