getDependentMetrics() as $dependentMetric) { $sum += self::getMetric($row, $dependentMetric); } return $sum; } public function format($value, Formatter $formatter) { if ($formatter instanceof Formatter\Html && !$value ) { return '-'; } else { return $formatter->getPrettyTimeFromSeconds($value, $displayAsSentence = true); } } public function getDependentMetrics() { return ['avg_time_network', 'avg_time_server', 'avg_time_transfer', 'avg_time_dom_processing', 'avg_time_dom_completion', 'avg_time_on_load']; } }