public function getTotal($rp, $metric, $tags) {
        try {
            $todayDt = date("Y-m-d") . "T00:00:00Z";
            
            return  $this->mapper->getRpSum('forever', $metric, $tags) +
                    $this->mapper->getRpSum($rp, $metric, $tags, $todayDt) +
                    $this->mapper->getSum($metric, $tags);
        } catch (Exception $e) {
            throw new AnalyticsException("Analytics client get total exception", 0, $e);
        }
    }