I just noticed this on my MacBook Air. Does anyone know what it is/how I can prevent death by MacBook Air?

Is that rust? Looks like something caught in and stuck there... I would say you just need a new MagSafe connector board if it is separate on an MBA.
When I packed up my laptop on Friday it wasn't like this so I don't think it's rust. It has a blackish metallic texture to it like burnt wires or something. Charging, etc. works fine though.
Should I take it to the Apple Store or should I try cleaning it myself? I'm worried Apple will void my warranty...
If its still in warranty, just make an appointment and take it in. Not worth the risk IMO.
OK, thanks for the advice guys. I'll take it to the Apple Store next weekend and let you know how it goes.
Funny, this thread got me to look at the magsafe port on my 2013 11" MBA. It is also showing some similar discoloration, although much less severe - mine is only at the extreme left and right edge.
I agree, this should have nothing to do with the electrical part of the connection which is isolated by a plastic insulator, it is only in the magnetic area. On mine, I think it's just a buildup of crud and probably doesn't affect much of anything. But yours is much worse, and the photo also shows some marks on the aluminum body itself.
What kind of environment do you use your computer it? High humidity, dirty air or anything else unusual?
Have you tried to pick whatever it is out of there with a toothpick or something similar? There's strong magnets there which like to collect debris.
you are going to die if you touch that do not do so under any circumstances