The title pretty much says it all. We’ll be upgrading critical infrastructure. During this time, users will notice actions involving writing to the database including logging in, saving drafts, publishing or scheduling stories, commenting, flagging/recommending, signing up for a new account, writing Kosmail, etc will be unavailable for approximately 15-20 minutes. The precise start and end time of the outage are expected to be within this window, but we can’t guarantee either end.