Blue post · Kaivax
Brief Realm Maintenance - October 5
KaivaxSummary
On 5 October Blizzard announced brief realm restarts to apply fixes for service quality. Players in game would see countdown messages, and the Beta would reopen a few minutes after going offline.
Read the original on Blizzard's forums
This is our own summary of what Blizzard posted, not Blizzard's text. The original is the authority.