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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.
Please enable the gitlab email integration, this allows people to reply to issues directly from their email client, file new issues via email and create new merge requests via email. The ability to reply to issue mails is what I would like the most.
https://docs.gitlab.com/ce/administration/incoming_email.html