That's surface cracks. Nothing on the edges. Measure the thickness of the rotor. To make you feel better. You can take a skin cut across the rotor on a lathe. Take about .005" per side off to see if it cleans up. But make sure you do not go under the min spec.
Me, I would mike the thickness to see how much is left. Then keep driving until I see bigger cracks. I have the same rotors.
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