docs: def get_event_action(cls) -> Optional[str]:
          """Return the second part of the event_type
  
          e.g.
  
          >>> Event.event_type = 'experiment.deleted'
          >>> Event.get_event_action() == 'deleted'
          """
          if not cls.actor:
              return None
          return event_context.get_event_action(cls.event_type)