code: func (m *GracefulTerminationManager) MoveRSOutofGracefulDeleteList(uniqueRS string) error {
  	rsToDelete, find := m.rsList.exist(uniqueRS)
  	if !find || rsToDelete == nil {
  		return fmt.Errorf("failed to find rs: %q", uniqueRS)
  	}
  	err := m.ipvs.DeleteRealServer(rsToDelete.VirtualServer, rsToDelete.RealServer)
  	if err != nil {
  		return err
  	}
  	m.rsList.remove(rsToDelete)
  	return nil
  }
docs: // MoveRSOutofGracefulDeleteList to delete an rs and remove it from the rsList immediately