This version introduces two new features and a few minor fixes.

• [RIP-80] Implement Priority Message by @imzs in https://github.com/apache/rocketmq/pull/9929
• [RIP-82] Implement Timer message, transaction message, and index based on RocksDB by @zk-drizzle in https://github.com/apache/rocketmq/pull/9787

What's Changed

• [ISSUE #9891] Optimize pop orderly implementation to facilitate expansion by @qianye1001 in https://github.com/apache/rocketmq/pull/9892
• [ISSUE #9883] Remove unnecessary MessageFormat.format by @yx9o in https://github.com/apache/rocketmq/pull/9884
• [ISSUE #9888] Defer the shutdown behavior of popConsumerService to prevent JVM crash by @RongtongJin in https://github.com/apache/rocketmq/pull/9889
• [ISSUE #9894] Update README for RocketMQ 5.3.4 and minor fixes by @majialoong in https://github.com/apache/rocketmq/pull/9895
• [ISSUE #9396] Use fastjson2 in all modules by @yx9o in https://github.com/apache/rocketmq/pull/9397
• Add some log for gRPC route by @qianye1001 in https://github.com/apache/rocketmq/pull/9896
• Fix controller mode HAService removeConnection by @LittleBoy18 in https://github.com/apache/rocketmq/pull/9897