Be sure that is just cosmetic before you ride it. I got home on a fork with almost exactly that as a full crack. One cm higher, right under the crown. The bike was shuddering wildly every time I hit the front brake so I rode the last 5 miles rear only. Front wheel passed true on the wheel stand with flying colors. Went back to the bike and gently spread the forks. Right blade bent out 8". I turned, walked back into the house and sat down, shaken to the core. I descended 2000' that ride.

Lesson learned: If you nickle plate a quality steel fork, make sure the plater heat treats it properly to drive off the embedded hydrogen molecules. This plater didn't (and didn't say anything). Your fork won't have that issue but if that is a crack, you could have the same experience or worse. (I babied the bike down the descents because of a completely unrelated mechanical. Could well have saved my life. There was a corner half way down that I love to come into hard, slam the brakes and rocket around. Tight but nicely banked.)

Ben