what appears to be cracked rim?

I was checking over the wife’s road bike when we noticed that the front wheel had a crack in the paint from the one brake face to 3/4 of the way around to the other side of the rim where it disappears. The wheels are American Classic 420 aero deep dished rims new just under two years ago. The rear wheel is fine smooth with a unidentifiable joint as it were when new.
Not 100% on what to de next anyone got any experience of this or similar?
Not 100% on what to de next anyone got any experience of this or similar?
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A lot of rims are just pinned together at the top. You are most likely seeing a tiny bit of movement and it is nothing to be worried about but don't risk the opinions on here take it to somebody to inspect,
http://www.velominati.com/blog/the-rules/