flink 1.20 添加了 MDC[1] 支持，使用 logback 的时候存在bug，logback context 会返回 null 值，下游处理会引起 npe issue: [flink 1.20 not suport logback] https://issues.apache.org/jira/browse/FLINK-36104 MDC [1]: https://nightlies.apache.org/flink/flink-docs-release-1.20/docs/deployment/advanced/logging/#structured-logging
