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

<div class="panel panel-default">
    <div class="panel-heading">
        <span>Plugin Output</span>
    </div>
    <div class="panel-body">
        <?= $this->pluginOutput($this->object->output); ?>
        <?= $this->pluginOutput($this->object->long_output); ?>
    </div>
</div>