code: func (o *SAControllerOptions) ApplyTo(cfg *serviceaccountconfig.SAControllerConfiguration) error {
  	if o == nil {
  		return nil
  	}
  
  	cfg.ServiceAccountKeyFile = o.ServiceAccountKeyFile
  	cfg.ConcurrentSATokenSyncs = o.ConcurrentSATokenSyncs
  	cfg.RootCAFile = o.RootCAFile
  
  	return nil
  }
docs: // ApplyTo fills up ServiceAccountController config with options.