37signals/Basecamp wrote about something similar on their blog, they saw traffic switching almost immediately: https://signalvnoise.com/posts/3857-when-disaster

37signals/Basecamp wrote about something similar on their blog, they saw traffic switching almost immediately: https://signalvnoise.com/posts/3857-when-disaster-strikes https://signalvnoise.com/posts/3857-when-disaster-strikes and in their comments they said it was hinted that it was just a DNS update with low TTLs.