text: from os import getenv
  
  # Celery Context key
  CTX_KEY = '__dd_task_span'
  
  # Span names
  PRODUCER_ROOT_SPAN = 'celery.apply'
  WORKER_ROOT_SPAN = 'celery.run'
  
  # Task operations
  TASK_TAG_KEY = 'celery.action'
  TASK_APPLY = 'apply'
  TASK_APPLY_ASYNC = 'apply_async'
  TASK_RUN = 'run'
  TASK_RETRY_REASON_KEY = 'celery.retry.reason'
  
  # Service info
  APP = 'celery'
  # `getenv()` call must be kept for backward compatibility; we may remove it
  # later when we do a full migration to the `Config` class
  PRODUCER_SERVICE = getenv('DATADOG_SERVICE_NAME') or 'celery-producer'
  WORKER_SERVICE = getenv('DATADOG_SERVICE_NAME') or 'celery-worker'
  