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--> This KIP doesn't care about the group epoch number at all. The subscription metadata is passed from each members to group coordinator, and then pass all of them back to consumer lead. So even if the epoch number is reused in a group, it should be fine. On the other hand, the group coordinator will have no idea if the join group request sent from consumer containing the new subscription "generation" field or not, because group coordinator won't deserialize the metadata.