As of 2024-05-14 a change has been implemented to enforce access token expiry. If you see higher numbers of HTTP 401 responses, please check tokens that may have expired. For more details, including how to mitigate disruption, please check our docs guide on Expired Access Tokens. If you have a support contract, you may open a support ticket for additional assistance.
A background type change requires a cleanup step, the same as any other background migration. I think it's useful to mention that explicitly.
Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/47591.