We get it that you're worried about hairline cracks in the ceramic of your kamado coming across as a cosmetic imperfection, or even a manufacturing defect.
Don't panic! The issue is craquele. Your kamado is made of natural material. Craquelé is a characteristic of ceramic glazed products. It breathes and it lives. So a good kamado will always have craquelure, to a greater or lesser degree. After the firing process of the glazed ceramic during the production of the kettle, very minimal residual moisture may remain. Sometimes the hair cracks look remarkably white. That is the ceramic dust what is pushed out by the moisture. So when heated, this can become more. This is not harmful to the ceramics.
What you can do is treat your kamado with and Polish. If you have done that a few times, you will see that the white effect diminishes and even goes away. Moreover, you can protect your kamado with this and keep it clean, 2 birds with one stone!. The polish is colorless and can be used for different colors of ceramics.