Description:
As of 8.0.30, the new redo log format is applied upon the upgrade step, as follows:
2022-09-19T08:20:12.012822Z 1 [Note] [MY-012529] [InnoDB] Redo log format is v4. The redo log was created before MySQL 8.0.30.
2022-09-19T08:20:12.056008Z 1 [Note] [MY-012557] [InnoDB] Redo log is from an earlier version, v4.
2022-09-19T08:20:12.057534Z 1 [Note] [MY-012532] [InnoDB] Applying a batch of 0 redo log records ...
2022-09-19T08:20:12.057625Z 1 [Note] [MY-012535] [InnoDB] Apply batch completed!
2022-09-19T08:20:12.058561Z 1 [Note] [MY-013888] [InnoDB] Upgrading redo log: 0M, LSN=18229772.
2022-09-19T08:20:12.060926Z 1 [Note] [MY-012968] [InnoDB] Starting to delete and rewrite redo log files.
2022-09-19T08:20:12.221052Z 1 [Note] [MY-012893] [InnoDB] New redo log files created, LSN=18230284
2022-09-19T08:20:12.221140Z 1 [Note] [MY-013083] [InnoDB] Log background threads are being started...
...
2022-09-19T08:20:19.371998Z 4 [System] [MY-013381] [Server] Server upgrade from '80028' to '80030' completed.
However, this fact is missed in the documentation:
https://dev.mysql.com/doc/refman/8.0/en/upgrading-what-is-upgraded.html
https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log.html
How to repeat:
Try to find any documentation on what happens with the redo log during the version upgrade.
