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

<tr>
    <th><?= $this->translate('Comments'); ?></th>
    <td>
        <?php if ($this->hasPermission('monitoring/command/comment/add')) {
            /** @var \Icinga\Module\Monitoring\Object\MonitoredObject $object */
            if ($object->getType() === $object::TYPE_HOST) {
                echo $this->qlink(
                    $this->translate('Add comment'),
                    'monitoring/host/add-comment',
                    array('host' => $object->getName()),
                    array(
                        'icon'              => 'comment',
                        'data-base-target'  => '_self',
                        'title'             => $this->translate('Add a new comment to this host')
                    )
                );
            } else {
                echo $this->qlink(
                    $this->translate('Add comment'),
                    'monitoring/service/add-comment',
                    array('host' => $object->getHost()->getName(), 'service' => $object->getName()),
                    array(
                        'icon'              => 'comment',
                        'data-base-target'  => '_self',
                        'title'             => $this->translate('Add a new comment to this service')
                    )
                );
            }
        } else {
            echo '&#45;';
        } ?>
    </td>
</tr>

<?php

foreach ($object->comments as $comment) {
    // Ticket hook sample
    $commentText = $this->tickets ? preg_replace_callback(
        $this->tickets->getPattern(),
        array($this->tickets, 'createLink'),
        $this->escape($comment->comment)
    ) : $this->escape($comment->comment);

    ?>
    <tr>
        <th><?= $this->escape($comment->author); ?> (<?= $this->timeAgo($comment->timestamp); ?>)</th>
        <td data-base-target="_self">
            <?php if (isset($delCommentForm)) { // Form is unset if the current user lacks the respective permission
                $delCommentForm = clone $delCommentForm;
                $delCommentForm->populate(
                    array(
                        'comment_id' => $comment->id,
                        'comment_is_service' => isset($comment->service_description)
                    )
                );
                echo $delCommentForm;
            } ?>
            <span class="sr-only">(<?= $this->translate('Comment'); ?>): </span><?= str_replace(array('\r\n', '\n'), '<br>', $commentText); ?>
        </td>
    </tr>
<?php } // endforeach ?>