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https://www.lfgss.com/comments/17245070/incontext/ et seq.
It's up to you to decide whether it has gone from mark to groove, but your finger might feel a <1μm transition, well below the point where you need to start worrying.
Have a dreaded ring on my carbon steerer — is this done? It doesn't have a noticeable lip but you can feel the scratching when you run your finger over it. Annoyingly only a few hundred miles on the fork and the headset (from what I could tell) was tightened properly (no knocking, could not move spacers, etc)