docs: @Deprecated
      public Applications getApplicationDeltas() {
          GET_ALL_CACHE_MISS_DELTA.increment();
          Applications apps = new Applications();
          apps.setVersion(responseCache.getVersionDelta().get());
          Map<String, Application> applicationInstancesMap = new HashMap<String, Application>();
          try {
              write.lock();
              Iterator<RecentlyChangedItem> iter = this.recentlyChangedQueue.iterator();
              logger.debug("The number of elements in the delta queue is : {}",
                      this.recentlyChangedQueue.size());
              while (iter.hasNext()) {
                  Lease<InstanceInfo> lease = iter.next().getLeaseInfo();
                  InstanceInfo instanceInfo = lease.getHolder();
                  logger.debug(
                          "The instance id {} is found with status {} and actiontype {}",
                          instanceInfo.getId(), instanceInfo.getStatus().name(), instanceInfo.getActionType().name());
                  Application app = applicationInstancesMap.get(instanceInfo
                          .getAppName());
                  if (app == null) {
                      app = new Application(instanceInfo.getAppName());
                      applicationInstancesMap.put(instanceInfo.getAppName(), app);
                      apps.addApplication(app);
                  }
                  app.addInstance(new InstanceInfo(decorateInstanceInfo(lease)));
              }
  
              boolean disableTransparentFallback = serverConfig.disableTransparentFallbackToOtherRegion();
  
              if (!disableTransparentFallback) {
                  Applications allAppsInLocalRegion = getApplications(false);
  
                  for (RemoteRegionRegistry remoteRegistry : this.regionNameVSRemoteRegistry.values()) {
                      Applications applications = remoteRegistry.getApplicationDeltas();
                      for (Application application : applications.getRegisteredApplications()) {
                          Application appInLocalRegistry =
                                  allAppsInLocalRegion.getRegisteredApplications(application.getName());
                          if (appInLocalRegistry == null) {
                              apps.addApplication(application);
                          }
                      }
                  }
              }
  
              Applications allApps = getApplications(!disableTransparentFallback);
              apps.setAppsHashCode(allApps.getReconcileHashCode());
              return apps;
          } finally {
              write.unlock();
          }
      }