code: def serialize_me(self, arn, event_time, tech, item=None):
          
          payload = {
              'arn': arn,
              'event_time': event_time,
              'tech': tech
          }
  
          if item:
              payload['item'] = item
  
          else:
              payload['event_too_big'] = True
  
          return self.dumps(payload).data.replace('<empty>', '')
docs: Dumps the proper JSON for the schema. If the event is too big, then don't include the item.
  
          :param arn:
          :param event_time:
          :param tech:
          :param item:
          :return: