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Troubleshooting and FAQ

This page addresses frequently asked questions and common troubleshooting topics for Langfuse Observability.

If you don't find a solution to your issue here, try using Ask AI for instant answers. For bug reports, please open a ticket on GitHub Issues. For general questions or support, visit our support page.

FAQ

How 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 setup
How to integrate Langfuse with an existing Sentry setup
How 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 Langfuse
Where 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 session view not rendering the conversation I expect to see?
Why is my Vapi project still on the Langfuse v3 experience?

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Marc KlingenMarc KlingenJannik MaierhöferJannik Maierhöfer
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