Monitoring AI Calls with Langfuse

This project demonstrates how to implement request tracing and monitoring for OpenAI SDK calls using Langfuse. It provides a ready-to-use setup with Docker Compose for easy deployment on VPS environments.

⚠️ Production Notice: This setup is intended for development and testing. For production environments:

• Use Docker Swarm or Kubernetes instead of Docker Compose for better scalability and orchestration
• Configure SSL/TLS certificates (not included in this setup)
• Update all default credentials
• Consider implementing proper load balancing

🎯 Overview

Monitor and analyze your AI application's performance, costs, and behavior using Langfuse's powerful observability platform. This implementation uses the official Langfuse Docker Compose setup for self-hosting and includes Ollama integration for local LLM support.

🚀 Features

• Self-hosted Langfuse instance
• OpenAI SDK integration
• Ollama integration with gemma:2b model
• Request tracing and monitoring
• Cost analysis
• Performance metrics
• Prompt management
• Evaluation capabilities
• Automatic model downloading

🛠 Prerequisites

• Docker and Docker Compose installed
• Basic understanding of Docker and containerization

📦 Installation

1. Clone this repository:

git clone https://github.com/erickwendel/monitoring-llms-langfuse-ollama.git
cd monitoring-llms-langfuse-ollama

2. Configure environment variables:

The project includes a default .env file with pre-configured settings:

• Default Langfuse API keys (ready to use)
• Ollama configuration (using gemma:2b model)
• Pre-configured user credentials:
  • Email: erickwendel@test.com
  • Password: admin@123
• Domain configuration (defaults to localhost, update DOMAIN for production)

3. Start the Langfuse stack:

docker compose up -d

This will:

• Start all Langfuse components
• Launch Ollama server
• Automatically download and configure the gemma:2b model
• Initialize the monitoring stack

4. Access the Langfuse UI:

http://localhost:3000

5. restore the app's dependencies and run it:

npm ci
npm run dev

6. make requests

sh scripts/run-request.sh

🔧 Configuration

The project uses the official Langfuse Docker Compose configuration with the following main components:

• Langfuse Web UI
• PostgreSQL database
• Redis
• ClickHouse
• MinIO (for blob storage)
• Ollama (for local LLM support)
• Ollama Model Loader (automatically downloads required models)

Environment Variables

Key environment variables in .env:

OPENAI_MODEL='gemma:2b'
DOMAIN=srv665452.hstgr.cloud  # Update this for production
OPENAI_SITE_URL=http://${DOMAIN}:11434/v1
OPENAI_API_KEY='ollama'
OPENAI_SITE_NAME='Ollama'

# Pre-configured Langfuse keys
LANGFUSE_SECRET_KEY="sk-lf-fcc57d58-e494-421e-97d2-45e9c3302313"
LANGFUSE_PUBLIC_KEY="pk-lf-93c16cbd-c4f0-4b68-880e-5f1da1038032"

🏗 Architecture

The setup follows Langfuse's recommended architecture for self-hosted instances:

• Frontend container exposed on port 3000
• Ollama service on port 11434
• Secure internal network for components
• Persistent volume storage for databases
• MinIO for object storage
• Automatic model management through Ollama

🔐 Security Considerations

• Update all default passwords in the Docker Compose file
• Configure proper firewall rules
• Use SSL/TLS for production deployments (not included in base setup)
• Implement proper authentication mechanisms
• Consider changing the default Langfuse API keys in production
• Set up proper network segmentation
• Implement rate limiting
• Configure regular security updates

📈 Monitoring

Access your Langfuse dashboard to view:

• Request traces
• Response times
• Token usage
• Cost analytics
• Prompt performance
• Model behavior
• Ollama model performance metrics

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Langfuse for their excellent observability platform
• Hostinger for VPS hosting capabilities
• Ollama for local LLM support
• OpenAI for their SDK

📞 Support

If you encounter any issues or have questions, please open an issue in this repository.