code: @GET
      public Response getInstanceInfo() {
          InstanceInfo appInfo = registry
                  .getInstanceByAppAndId(app.getName(), id);
          if (appInfo != null) {
              logger.debug("Found: {} - {}", app.getName(), id);
              return Response.ok(appInfo).build();
          } else {
              logger.debug("Not Found: {} - {}", app.getName(), id);
              return Response.status(Status.NOT_FOUND).build();
          }
      }
docs: Get requests returns the information about the instance's
  {@link InstanceInfo}.
  
  @return response containing information about the the instance's
  {@link InstanceInfo}.