omg how fast you are, I was about to notice this downtime here.I noticed myself (before even our users notice that) that the website is loading slow at the moment. I will do some checking now to make sure this don't remain for the next 10 minutes.
Will keep you all updated.
Update: Within 3 minutes, I founded the problem. It's some useless heavy load of cache on our databases and our load balancers.
Working right now to clear everything, and will edit some codes to prevent such thing from happening again.
Everything should be fine within the next few minutes, it will be recovered gradually.