public function execute() {
        global $DB, $CFG;

        require_once($CFG->dirroot . '/auth/mnet/auth.php');
        $mnetplugin = new \auth_plugin_mnet();
        $mnetplugin->keepalive_client();

        $random100 = rand(0,100);
        if ($random100 < 10) {
            $longtime = time() - DAYSECS;
            $DB->delete_records_select('mnet_session', "expires < ?", [$longtime]);
        }
    }