field_group-8.x-3.1/modules/field_group_accordion/field_group_accordion.install

<?php

/**
 * @file
 * Update hooks for the Field Group module.
 */

/**
 * Implements hook_requirements().
 */
function field_group_accordion_requirements($phase) {
  $requirements = [];

  if ($phase == 'runtime') {
    $requirements['field_group_jquery_ui_accordion'] = [
      'title' => t('Field Group'),
      'value' => t('jQuery UI Accordion is deprecated'),
      'description' => t('This module is deprecated, as the Jquery UI library is EOL.'),
      'severity' => REQUIREMENT_WARNING,
    ];
  }

  return $requirements;
}