Just finished my empennage inventory.
I found the same problem on two different parts (left and right I suppose).
The hole is not free from burr and rust is showing.
Should I worry about this?
I wouldn't worry. It's baked paint. Sand it and prime. I would recommend scuffing, priming and painting all powder coated controls brackets. If not treated eventually all of them start rusting. I can show you mine after 5 years of flying unpainted