Sometimes part of that complexity maintaining a Distribution can be the need of "forcing" proposed-migrations .
But I recently faced this from a different point of view.
I wondered about a package being in -updates and thought "was anything forced when this migrated"?
As far as I asked around nobody knew any place this could be checked.
A log like this would allow three things:
- clarification if something was forced if ever in doubt
- tracking counts in that list would allow to identify issues that really should be fixed to avoid forcing them "regularly"
- it could be an extra source of info for Archive Admins that need to solve complex cases
Therefore - is there already any log or tracking of those overrides?
If not, would that be a reasonable addition and where/how should it be implemented?
It some sense it seems to me like an extension to  which would add the reasoning if forced.
In this particular case I know e.g. that 9.5.7-0ubuntu0.16.10 was forced.
Software Engineer, Ubuntu Server