We understand that you are concerned about hairline cracks in the ceramic of your kamado, which come across as a cosmetic imperfection, or even a manufacturing defect.
Do not panic! It's about crackle. Your kamado is made of natural material. The crackle is a characteristic of ceramic glazed products. It breathes and it lives. A good kamado will therefore always show hairline cracks, to a greater or lesser extent. After the firing process of the glazed ceramic during the production of the boiler, very minimal residual moisture can remain. Sometimes the hairline cracks look strikingly white. That is the ceramic dust that is pushed out by the moisture. This can increase with heating. This is not harmful to the ceramic.
What you can do is treat your kamado with a polish, for example this one. Once you've done that a few times, you'll see that white effect diminish and even go away. Moreover, you can protect and clean your kamado with this, 2 birds with 1 stone! The polish is colorless and can therefore be used for different colors of ceramics.