Today when I saw that the post notice for a migrated post looks like this:
Now what struck me as odd was that the word "Migrated" is used as an hyperlink twice. The first occurrence links to the FAQ post that explains what migrations is. The second links to the questions timeline.
The placement of the first hyperlink is super obvious and useful. But I feel that the second hyperlink could best be placed elsewhere, namely on the "20 mins ago" part. As then there is a time that links to the timeline.
This would then be similar to how we link to the revision history for edited posts, but I don't think that would create much confusion.