Rust Over Pilot Lights
Is caused by the moisture from burning gas, also this is moisture is very corrosive to most metals and even glass.
I remember when I installed my first condensing gas furnace, and I did not get around to connecting the drain to the heat exchanger so I ran the drain tube into a beautiful old porcelain crisper drawer I had, and within one week the inch or so of water in the crisper had eaten through the porcelain and the pan was nothing but rust, it ate right through the glass finish.
The best hing that ever happened to gas stoves was getting rid of constant burning pilot lights, now if they could just get rid of the gas flame altogether, LOL, gas oven liners still get all corroded and nasty after a lot of use, and burner grates and your beautiful cookware are another matter.