You might get lucky at MarineParts Depot and find a stainless deck item suitable to solve the long term problem. Perhaps a wider, larger chock or fairlead. Find dimensions if you drill into a part. Items noted out of stock may still be available. Its really not good to have lines running on glass - as you can see. I suspect the damage is superficial to the decorative strip and not into the hull proper. I also use only epoxy for all repairs as noted above for the same reasons.
+1. I'd also hazard a guess that the cracking is actually caused by all the fasteners tapped into the glass in the immediate vicinity. I count three likely fasteners going into what looks like mostly filler. I'd pull the fitting and the section of rail underneath, then repair as needed. Once you pull the rail the cracks going underneath it will be obvious. Grinding them out will reveal exactly what the problem is and it's extent. But if you don't go under the rail it will come back. Then when you refasten go with one size larger pilot hole into the glass and/or a tap to prevent the same problem reoccuring.
I second this as the best course. It does look like a lot of brittle filler in there to me from the picture.