public function submitForm(array &$form, FormStateInterface $form_state) {
$_SESSION['dblog_overview_filter'] = [];
$this->connection->truncate('watchdog')->execute();
- drupal_set_message($this->t('Database log cleared.'));
+ $this->messenger()->addStatus($this->t('Database log cleared.'));
$form_state->setRedirectUrl($this->getCancelUrl());
}