Install Atatus Python APM agent in FastAPI server

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Installation steps

1. Install the Atatus python agent: Option 1: Install the agent using pip.
   pip install atatus
   
   Option 2: Add atatus to your project’s requirements.txt file, and install the agent using pip.
   # requirements.txt
   atatus
   
   pip install -r requirements.txt
   
2. Add Atatus configuration to main.py file.
   # main.py
   from fastapi import FastAPI
   
   # Import Atatus
   import atatus
   from atatus.contrib.starlette import create_client, Atatus
   
   # Initialize Atatus.
   # Note: Initialization should be done before "app = FastAPI()", and not in lifespan.
   atatus_client = atatus.get_client()
   if atatus_client is None:
       atatus_client = create_client({
           'APP_NAME': 'FastAPI App',
           'LICENSE_KEY': 'lic_apm_xxxxxxx',
           'NOTIFY_HOST': 'YOUR_ON_PREMISE_URL',
           'ANALYTICS_NOTIFY_HOST': 'YOUR_ON_PREMISE_URL',
       })
   
   app = FastAPI()
   
   # Add Atatus middleware
   # Note: Make sure to add Atatus middleware as the last middleware in your app
   app.add_middleware(Atatus, client=atatus_client)
   
3. Restart your FastAPI server