$message = $aggregator_feed->refreshItems()
? $this->t('There is new syndicated content from %site.', ['%site' => $aggregator_feed->label()])
: $this->t('There is no new syndicated content from %site.', ['%site' => $aggregator_feed->label()]);
- drupal_set_message($message);
+ $this->messenger()->addStatus($message);
return $this->redirect('aggregator.admin_overview');
}