public static function get_level_options() {
        return array(
            \core\event\base::LEVEL_TEACHING      => get_string('teaching', 'logstore_database'),
            \core\event\base::LEVEL_PARTICIPATING => get_string('participating', 'logstore_database'),
            \core\event\base::LEVEL_OTHER         => get_string('other', 'logstore_database'),
        );
    }