So...what happened to all the servers last night?

I was playing around on GMOD for a while, and realised there were so few servers. So I fired up my old server and asked a freind to join, and the slots instantly filled up pretty much, which probably means the other servers were down…
Just wondering, anyone own a hosted server and know what happened?

http://www.facepunch.com/showpost.php?p=24982201&postcount=2

it was an Update.