### Summary In https://gitlab.com/gitlab-org/omnibus-gitlab/issues/4501, users are running into an issue with upgrades because migrations are still running in the background. ### Solution As an interim solution to help prevent ongoing issues when upgrading, we should add documentation to the upgrade docs on how to check if background migrations have completed. In a future release we should [put guardrails in place](https://gitlab.com/gitlab-org/omnibus-gitlab/issues/4501). This documentation issue is expected to uncover details that will inform the solution for adding guardrails to prevent upgrades when background migrations are still running.