private static String decode(String base64text) {
        return new String(Base64.getDecoder().decode(base64text), StandardCharsets.UTF_8);
    }
@param base64text Base64 encoded UTF-8 string
@return normal literal string
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/IDManager.java