public function getSessionsByTag($tag)
    {
        $taggedSessions = [];
        foreach ($this->metaDataCache->getByTag(Session::TAG_PREFIX . $tag) as $sessionIdentifier => $sessionInfo) {
            $session = new Session($sessionIdentifier, $sessionInfo['storageIdentifier'], $sessionInfo['lastActivityTimestamp'], $sessionInfo['tags']);
            $taggedSessions[] = $session;
        }
        return $taggedSessions;
    }