While I don't have any cracks or hariline cracks on my firebowl that looks to be very minor so I wouldn't worry about. Vision already has your pic documented so if anything further happens you'll be covered. However If your not satisifed just tell them so and they will replace it. I had a small wobble issue with my firebox and made a shim for it and let them know and they're response was that if I still was not happy they will send me out a whole new bowl which I declined becuase it wasn't a big dealfor me after the fix.
36" DCS NG Grill - Vision Kamado PRO - 36" Blackstone Griddle LP-'10 Weber Performer-PBC