An interesting question.
If this was a cheap rim it wouldn't even blip my radar. That looks like the seam where the rim extrusion was joined. Betting the valve stem hole is exactly opposite. If nothing else, the tire beads alone are going to hold the rim together.
This, however, isn't a cheap rim. Consequently I'd be interested in hearing what HED has to say about it. I'd be more concerned about value for the money than about the rim falling apart.
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