new_contents: """
  A component which is collecting configuration errors.
  
  For more details about this component, please refer to the documentation at
  https://home-assistant.io/components/persistent_notification/
  """
  
  DOMAIN = "persistent_notification"
  
  
  def create(hass, entity, msg):
      """Create a state for an error."""
      hass.states.set('{}.{}'.format(DOMAIN, entity), msg)
  
  
  def setup(hass, config):
      """Setup the persistent notification component."""
      return True
  
subject: Add persistent notification component (#1844)