Is this okay? Heat checking? It's on both drivers & pass rotors following a couple track days with HP+ pads. It's pretty narrow - the pads are wider than the ring you see in the pic. I didn't really notice it until lately so I don't know if it was from last season or just recently as the car is out of winter storage (street usage). I do the cool down laps and try not to let the car sit after I get into the pits (hard because HPDE1/2 makes you attend the drivers meeting right after the session). Any negative impact? thanks.