Help with Brake rotors mk8 gti

Hello all. I have a mk8 gti with less than 5k miles and I noticed my rear brakes have some squeaks at low speeds, checked out my rear rotors and I can see these micro cracks formed. The outline matches the brake pad shape. I have these marks on both sides, but only one side has a noticeable split.

Is this a common issue? Has anyone had rotors go out so quickly on a brand new car?