Langfuse v3 SDK Goes OTEL-Native: LLM Observability Built on OpenTelemetry Standard — 25.3K Stars, Trending

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Langfuse's v3 SDK is a thin layer on the official OpenTelemetry client that automatically converts spans into Langfuse observations with first-class helpers for token usage, cost tracking, prompt linking, and scoring. Because it lives in the shared OTEL context, spans from any OTEL-instrumented library export to Langfuse — enabling multi-language support (Java, Go, Rust) without language-specific SDKs. Trending at 25.3K stars.