public static function newInstance()
 {
     $instance = new MultimeterControl();
     // NOTE: We don't set the sample rate yet. This allows the multimeter to
     // be initialized and begin recording events, then make a decision about
     // whether the page will be sampled or not later on (once we've loaded
     // enough configuration).
     self::$instance = $instance;
     return self::getInstance();
 }