app.yml

# Specifies the runtime environment (Python 3.9 or 3.11 depending on your preference)
runtime: python39

# Command to start the app using Gunicorn
entrypoint: gunicorn -b :$PORT main:app

# Instance class (F1 is the smallest and cheapest for a simple app)
instance_class: F1

# Scaling settings to manage traffic
automatic_scaling:
  target_cpu_utilization: 0.65  # Scale up when CPU usage exceeds 65%
  min_instances: 1             # Keep at least 1 instance running
  max_instances: 10            # Allow up to 10 instances for high traffic
  target_throughput_utilization: 0.6  # Scale based on request throughput

# Optional: Environment variables (if your app needs them)
env_variables:
  FLASK_ENV: "production"  # Example: Set Flask to production mode

# Optional: Handlers for static files (if you add static assets later)
handlers:
  - url: /.*
    script: auto  # Let App Engine handle routing to your Flask app