Pulp

For immediate content, it will give an idea of how long the switch to the new checksum setting might take (may need to just display the amount of content and provide docs a timeframe based on content count).

For on_demand content, show how many items will be unusable if a user doesn’t go back and download that content. It should also show what repos contain this content so users can download (or immediate sync) this content before switching.

For publications (rpm specific), produce a list of affected ones, so user knows what to republish (file separate task for this?)

Also, update this error message[0] to point users to how they can check on-demand content using this new tool.

[0] https://github.com/pulp/pulpcore/blob/94bb713f2a9f7a0c167305588fed47b039481045/pulpcore/app/settings.py#L347