public static function pluginQuestions($class_suffix = '') {
    $questions['plugin_label'] = new Question('Plugin label', 'Example');
    $questions['plugin_label']->setValidator([Utils::class, 'validateRequired']);
    $questions['plugin_id'] = new Question('Plugin ID', [Utils::class, 'defaultPluginId']);
    $questions['plugin_id']->setValidator([Utils::class, 'validateMachineName']);
    $questions['class'] = static::pluginClassQuestion($class_suffix);
    return $questions;
  }