anchor.diff:  
   In the aforementioned examples the aliases are `newsletter` and `mailing`. Example of Feign usage with `newsletter` would be:
   
  +[source,java,indent=0]
   ----
   @FeignClient("newsletter")
   public interface NewsletterService {
  
positive.code: 
  Netflix Eureka supports having instances registered with the server that are `OUT_OF_SERVICE` and not returned as active service instances. This is very useful for behaviors such as blue/green deployments. The Curator Service Discovery recipe does not support this behavior. Taking advantage of the flexible payload has let Spring Cloud Zookeeper implement `OUT_OF_SERVICE` by updating some specific metadata and then filtering on that metadata in the Ribbon `ZookeeperServerList`. The `ZookeeperServerList` filters out all non-null instance statuses that do not equal `UP`. If the instance status field is empty, it is considered `UP` for backwards compatibility. To change the status of an instance POST `OUT_OF_SERVICE` to the `ServiceRegistry` instance status actuator endpoint.
  
   ----
   $ echo -n OUT_OF_SERVICE | http POST http://localhost:8081/service-registry/instance-status
   ----
  
   NOTE: The above example uses the `http` command from https://httpie.org
  
  
negative.code: 
  Let's take a closer look at an example of dependencies representation:
  
  [source,yml,indent=0]
  .application.yml
  ----
  spring.application.name: yourServiceName
  