edlp_d8/sites/all/modules/contrib/admin/piwik/piwik.install

<?php

/**
 * @file
 * Installation file for Piwik - Web analytics module.
 */

use Drupal\Core\Url;

/**
 * Implements hook_uninstall().
 *
 * Remove cache directory if module is uninstalled.
 */
function piwik_uninstall() {
  piwik_clear_js_cache();
}

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

  if ($phase == 'runtime') {
    $config = \Drupal::config('piwik.settings');

    // Raise warning if Piwik user account has not been set yet.
    if (!preg_match('/^\d{1,}$/', $config->get('site_id'))) {
      $requirements['piwik_site_id'] = [
        'title' => t('Piwik module'),
        'description' => t('Piwik module has not been configured yet. Please configure its settings from the <a href=":url">Piwik settings page</a>.', [':url' => Url::fromRoute('piwik.admin_settings_form')->toString()]),
        'severity' => REQUIREMENT_WARNING,
        'value' => t('Not configured'),
      ];
    }
  }

  return $requirements;
}