public function startAction($actionName)
    {
        $startStopwatch = $this->stopwatch && empty($this->actionStack);

        $this->actionStack[] = ['name' => $actionName, 'time' => microtime(true), 'subtrahend' => 0];
        $this->lastActionIndex++;
        if ($startStopwatch) {
            $this->stopwatch->start($this->getStopwatchName(), $this->sectionName);
        }
    }