FAQ: Observability

• How do I track LLM cost and tokens in Langfuse?
• How do I work with observations in Langfuse Fast Preview (Langfuse v4)?
• How to enable or disable Langfuse tracing?
• How to evaluate sessions/conversations?
• 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
• What does a good trace look like?
• Where do I find my Langfuse API keys?
• Which packages and projects are using Langfuse?
• Why are the input and output of a trace empty?
• Why do I see HTTP requests or database queries in my Langfuse traces?