docs: private Set<CacheKey> getCacheKeys() {
          Set<CacheKey> cacheKeys = new HashSet<CacheKey>();
          Applications apps = registry.getApplicationsFromLocalRegionOnly();
          for (Application app : apps.getRegisteredApplications()) {
              for (InstanceInfo instanceInfo : app.getInstances()) {
                  String localAccountId = getAccountId(instanceInfo, accountId);
                  String asgName = instanceInfo.getASGName();
                  if (asgName != null) {
                      CacheKey key = new CacheKey(localAccountId, asgName);
                      cacheKeys.add(key);
                  }
              }
          }
  
          return cacheKeys;
      }