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I would like to programmatically set a message shown at least once for selected users or for all users with a specific role.

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1 Answer 1

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Copy the following snippet to your module, then you have to replace MODULE with your module machine name

/**
 * Implements hook_preprocess_HOOK().
 */
function MODULE_preprocess_page(&$variables) {
  $message = t("You have been served!");
        $request = \Drupal::request();
  $session = $request->getSession();
  $message_was_displayed = $session->get('mymodule_message_was_displayed', FALSE);
  if ($message_was_displayed === FALSE) {
    $messenger = \Drupal::messenger();
    $messenger->addMessage($message);
    $session->set('mymodule_message_was_displayed', TRUE);
  }
}

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