I was never notified that my question had been migrated.
When something important happens (a new answer is posted, an answer is voted upon, etc) the envelope icon next to the username turns a different color. Clicking on this icon reveals Recent Activity.
There was never a notification that my question had been migrated, and no
Recent Activity showed up.
I just happened to be browsing ServerFault and found a question with the exact same title as mine, and found that my question had been migrated.
Please notify users when their question is migrated, preferably on both sites.