code: func (uc *UpstreamConfig) applyDefaults() {
  	if uc.DestinationType == "" {
  		uc.DestinationType = "service"
  	}
  	if uc.DestinationNamespace == "" {
  		uc.DestinationNamespace = "default"
  	}
  	if uc.LocalBindAddress == "" {
  		uc.LocalBindAddress = "127.0.0.1"
  	}
  }
docs: // applyDefaults sets zero-valued params to a sane default.