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  1. As the AlterPartition and Fetch requests are shared between ZK and Kraft mode, the related field will keep empty in ZK mode and will not be usedwe can just let the ZK controller ignore the broker epoch field.
  2. The metadata version/IBP version will be bumped. During the upgrade, leaders will leave the broker epoch field as -1 if the broker has not upgraded yet. The controller will skip the validation if the epoch is -1.

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