icingaweb2/modules/monitoring/application/views/scripts/show/components/notifications.phtml

<tr>
  <th><?= $this->translate('Notifications') ?></th>
  <td>
      <?php if ($this->hasPermission('monitoring/command/send-custom-notification')) {
      if ($object->getType() === $object::TYPE_HOST) {
          $ackLink = $this->href(
              'monitoring/host/send-custom-notification',
              array('host' => $object->getName())
          );
      } else {
          $ackLink = $this->href(
              'monitoring/service/send-custom-notification',
              array('host' => $object->getHost()->getName(), 'service' => $object->getName())
          );
      }
      ?>
      <?= $this->qlink(
          $this->translate('Send notification'),
          $ackLink,
          null,
          array(
              'icon'              => 'bell',
              'data-base-target'  => '_self',
              'title'             => $this->translate(
                  'Send a custom notification, share information about the'
                  . ' object to contacts.'
              )
          )
      ) ?><br />
      <?php } ?>
<?php
// We are not interested in notifications for OK or pending objects
if (! in_array((int) $object->state, array(0, 99))) {

    if ($object->current_notification_number > 0) {
        if ((int) $object->current_notification_number === 1) {
            $msg = sprintf(
                $this->translate('A notification has been sent for this issue %s.'),
                $this->timeAgo($object->last_notification)
            );
        } else {
            $msg = sprintf(
                $this->translate('%d notifications have been sent for this issue.'),
                $object->current_notification_number
            ) . '<br />' . sprintf(
                $this->translate('The last one was sent %s.'),
                $this->timeAgo($object->last_notification)
            );
        }
        echo $msg;
    } else {
        echo '('
            . $this->translate('No notification has been sent for this issue.')
            . ')';
    }
}
?>
  </td>
</tr>