perfdata.phtml: Collapse perfdata values if they exceed 5 lines

refs #3566

modules/monitoring/application/views/helpers/Perfdata.php

@@ -108,7 +108,7 @@ class Zend_View_Helper_Perfdata extends Zend_View_Helper_Abstract
                 return '';
             }
             return sprintf(
-                '<table class="performance-data-table">%s</table>',
+                '<table class="performance-data-table collapsible" data-visible-rows="6">%s</table>',
                 implode("\n", $table)
             );
         }

modules/monitoring/application/views/scripts/show/components/perfdata.phtml

@@ -1,4 +1,4 @@
 <?php if ($object->perfdata): ?>
 <h2><?= $this->translate('Performance data') ?></h2>
-<?= $this->perfdata($object->perfdata) ?>
+<div id="check-perfdata-<?= $this->escape(str_replace(' ', '-', $object->check_command)) ?>"><?= $this->perfdata($object->perfdata) ?></div>
 <?php endif ?>