docs: public static Resource create(String provider, String accountId, String region, String zone) {
      Map<String, String> labels = new LinkedHashMap<String, String>();
      labels.put(PROVIDER_KEY, checkNotNull(provider, "provider"));
      labels.put(ACCOUNT_ID_KEY, checkNotNull(accountId, "accountId"));
      labels.put(REGION_KEY, checkNotNull(region, "availabilityZone"));
      labels.put(ZONE_KEY, checkNotNull(zone, "zone"));
      return Resource.create(TYPE, labels);
    }