class CompletionMetadataUtils {

  public static Set<String> getZones(Map<String, Configuration> configurations) {
    ImmutableSet.Builder<String> zones = ImmutableSet.builder();
    configurations
        .values()
        .forEach(configuration -> zones.addAll(configuration.getZones().keySet()));
    return zones.build();
  }

  private  CompletionMetadataUtils();

}