Copy pageFAQ: ObservabilityHow do I track LLM cost and tokens in Langfuse?How do I work with the observations table in Langfuse v4?How long does it take for traces to appear in Langfuse?How to enable or disable Langfuse tracing?How to integrate Langfuse with an existing OpenTelemetry setupHow to integrate Langfuse with an existing Sentry setupHow to manage different environments in Langfuse?How to update traces, observations, and scores?How to use Langfuse Tracing in Serverless Functions (AWS Lambda, Vercel, Cloudflare Workers, etc.)I have setup Langfuse, but I do not see any traces in the dashboard. How to solve this?Link prompt management with tracing in LangfuseWhere do I find my Langfuse API keys?Which packages and projects are using Langfuse?Why are trace input and output empty?Why do I see HTTP requests or database queries in my Langfuse traces?Why do observation lookups with the v3 SDK return 404?Why is my Vapi project still on the Langfuse v3 experience?Ask another questionWas this page helpful?GoodBadSupport