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How to Build End-to-End LLM Observability in FastAPI with OpenTelemetry

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This article shows how to build end-to-end, code-first LLM observability in a FastAPI application using the OpenTelemetry Python SDK. Instead of relying on vendor-specific agents or opaque SDKs, we wi

Jessica Patel This article shows how to build end-to-end, code-first LLM observability in a FastAPI application using the OpenTelemetry Python SDK. Instead of relying on vendor-specific agents or opaque SDKs, we will manually design traces, spans, and semantic attributes that capture the full lifecycle of an LLM-powered request. Table of Contents Introduction Prerequisites and Technical Context Why LLM Observability Is Fundamentally Different Reference Architecture: A Traceable RAG Request Reference Architecture Explained Why This Design Is Better Than Simpler Alternatives LLM Models That Work

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