code: func InternalEndpointRegistryMessageFor(endpoint Endpoint, route InternalRoute, emitEndpointUpdatedAt bool) RegistryMessage {
  	var index string
  	if endpoint.InstanceGUID != "" {
  		index = fmt.Sprintf("%d", endpoint.Index)
  	}
  	since := endpoint.Since
  	if !emitEndpointUpdatedAt {
  		since = 0
  	}
  	return RegistryMessage{
  		URIs:                []string{route.Hostname, fmt.Sprintf("%s.%s", index, route.Hostname)},
  		Host:                endpoint.ContainerIP,
  		App:                 route.LogGUID,
  		Tags:                map[string]string{"component": "route-emitter"},
  		EndpointUpdatedAtNs: since,
  
  		PrivateInstanceIndex: index,
  	}
  }
docs: // This is used to generate registry messages for Internal routes