code: func (wa *AggregatedRegistration) Register(resyncName, keyPrefix string) error {
  	for _, registration := range wa.Registrations {
  		if err := registration.Register(resyncName, keyPrefix); err != nil {
  			logging.DefaultLogger.Warnf("aggregated register failed: %v", err)
  		}
  	}
  
  	return nil
  }
docs: // Register new key for all available aggregator objects. Call Register(keyPrefix) on specific registration
  // to add the key from that registration only