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Thanks for the advice ! You're both right, this discs are mounted on my do-it-all bike, and have seen a lot of abuse in the past year.
I'm using spyre so not subject of brake fade due to temperature. I managed a new set of pads this afternoon, I will source a vernier gauge to mesure them precisely.
Anyway, I find that the centerline worned out more quickly than an xt disc used in a similar way.
Thms
Scilly.Suffolk
Edscoble is right, you've done a lot of riding! And indeed if the road threw up grit onto the rotor then it will have acted a bit like sand paper and increased the rate of wear.
To expand a little on the question of whether you should change your rotors, Centerline rotors are 1.83mm-1.85mm when they are new. Sram, unlike some manufacturers, do not give a minimum thickness for safe use of their rotors, so we have to use common sense. As the rotor becomes thinner it gets hotter more quickly, leading to it warping more easily and affecting the performance of your brake fluid as it is compressed (called 'brake fade'). Also, because the metal is being worn by abrasion (as opposed to cutting) it becomes rougher and wears down your pad more quickly, as Edscoble says.
So that's the information you need to make a decision. If your notice any of the above symptoms, it may be time to change the rotors. However, be aware that the small edge you noticed on your rotors is very common and not a cause for concern in and of itself. If you can access a vernier gauge, measure the thickness of your rotors. I personally wouldn't consider changing them until they are less than 1.5mm.
Hope that's helpful.