Langfuse

• It's NOT part of the langchain project
• It's useful for troubleshooting and debugging
• It's an open source alternative to Langsmith

Installing

• https://langfuse.com/self-hosting/deployment/docker-compose

git clone https://github.com/langfuse/langfuse.git
cd langfuse
docker compose up

Configuring

• Access it at http://localhost:3000
• Sign up and log in
• Create a new organization
• Create a new project in that organization
• Configure tracing by creating an API Key

pip install langfuse
export LANGFUSE_SECRET_KEY = "sk-lf-..."
export LANGFUSE_PUBLIC_KEY = "pk-lf-..."
export LANGFUSE_BASE_URL = "http://localhost:3000"