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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Release pads by calling up into aggregator so it can do the right things. Don't clean up the pad until after that.
Add some missing locks around some accesses to shared pad state.