Langfuse v4: up to 165× faster · Read more
FaqAll FAQs
FaqAll FAQs

All FAQs

Administration

I cannot see my organization in Langfuse

I want to delete / cancel / close my Langfuse account

How do I enforce 2FA for all users?

I have forgotten my password

Inviting co-workers to Langfuse

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Article

Monitoring AI Research Assistants - Ensuring Accuracy and Reliability

What are the common challenges of building LLM applications?

Chatbot Analytics: Monitor, Evaluate & Improve Your AI Chatbot

LLM Analytics 101 — How to Measure and Improve Your LLM Application

What is LLM Observability & Monitoring?

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Auth

I want to delete / cancel / close my Langfuse account

I have forgotten my password

Inviting co-workers to Langfuse

Where is my Langfuse project?

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Blob Storage

I changed my blob storage config — why didn't it re-export, and why do I still see an error?

Why do I see empty files in my blob storage export?

How do blob storage export timing and retries work?

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Cloud

I cannot see my organization in Langfuse

How do I cut my Langfuse Cloud bill?

How to manage different environments in Langfuse?

How do I upgrade my Langfuse account?

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Evaluation

How do I work with the observations table in Langfuse v4?

How to use Langfuse-hosted Evaluators on Dataset Runs?

How do I upgrade trace-level evaluators to observation-level evaluators?

How to create and manage Score Configs in Langfuse?

I have setup Langfuse, but I do not see any traces in the dashboard. How to solve this?

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Evaluation Get Started

Why is my observation-level evaluator not executing?

What are scores in Langfuse and when should I use them?

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Experiments

Why are my experiment runs not visible after upgrading to Langfuse v4?

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Export Data

I changed my blob storage config — why didn't it re-export, and why do I still see an error?

Why do I see empty files in my blob storage export?

How do blob storage export timing and retries work?

How can I migrate data between Langfuse instances?

How to retrieve experiment scores via UI or API/SDK?

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Integration

How to customize the names of observations within a Langchain trace?

How to integrate Langfuse with an existing OpenTelemetry setup

How to integrate Langfuse with an existing Sentry setup

How to trace the OpenAI Assistants API?

Why is my Vapi project still on the Langfuse v3 experience?

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LangChain

How to customize the names of observations within a Langchain trace?

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Observability

How to use Langfuse Tracing in Serverless Functions (AWS Lambda, Vercel, Cloudflare Workers, etc.)

How do I track LLM cost and tokens in Langfuse?

Why are trace input and output empty?

How to enable or disable Langfuse tracing?

How to integrate Langfuse with an existing OpenTelemetry setup

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Observability Get Started

Why are trace input and output empty?

I have setup Langfuse, but I do not see any traces in the dashboard. How to solve this?

Why do I see HTTP requests or database queries in my Langfuse traces?

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OpenAI

How to trace the OpenAI Assistants API?

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OpenTelemetry

How to integrate Langfuse with an existing OpenTelemetry setup

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Platform

Why do I see 524 errors on Langfuse API calls?

Are there any limits to the Langfuse API?

I changed my blob storage config — why didn't it re-export, and why do I still see an error?

Why do I see empty files in my blob storage export?

How do blob storage export timing and retries work?

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Product

19 Questions about Langfuse Answered

Which packages and projects are using Langfuse?

How can I self-host Langfuse?

Ten Reasons to Use Langfuse for LLM Observability, Evaluations and Prompt Management

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Prompt Management

Can I dynamically select sub-prompts at runtime?

How to configure retries and timeouts when fetching prompts?

How to measure prompt performance?

Link prompt management with tracing in Langfuse

Can I manage agent skills with Langfuse Prompt Management?

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Prompt Management Get Started

I'm not seeing the latest version of my prompt. Why?

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Public API

Why do I see 524 errors on Langfuse API calls?

Are there any limits to the Langfuse API?

How do I migrate off the deprecated Langfuse APIs?

Where can I find the API reference for self-hosted Langfuse?

Where do I find my Langfuse API keys?

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Sdk

Why are my experiment runs not visible after upgrading to Langfuse v4?

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Self Hosting

Are prebuilt ARM images available?

Are older versions of the SDK compatible with newer versions of Langfuse?

Why is my data retention job running into timeouts?

I cannot connect to my docker deployment, what should I do?

I have forgotten my password

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Tracing

How do I work with the observations table in Langfuse v4?

How long does it take for traces to appear in Langfuse?

Why do observation lookups with the v3 SDK return 404?

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V4

Why are my experiment runs not visible after upgrading to Langfuse v4?

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Vapi

Why is my Vapi project still on the Langfuse v3 experience?

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Other

Dashboard changes in Langfuse v4

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