This page (https://support.atlassian.com/migration/docs/what-migrates-with-the-confluence-cloud-migration-assistant/) makes the statement regarding user macros:
User Macros: User macros are not migrated currently.
What does that mean in detail? What happens to the macro instance? Deleted? Placeholder? What happens to the macro data/parameters?
Can we develop a Forge App that replaces the user macro, with the result being a somewhat seamless migration? Or is enough data preserved that would could later run a script against the Cloud instance to migrate from a user macro to a Forge App?
We have 1000s of instances of user macros, that will be a royal PITA to manually migrate. I need to understand the scope of the issue.