On Wednesday, September 11, we will be performing system maintenance on some back-end data stores. During this time our track methods will be offline. They will return an HTTP 503 response code (Service Unavailable). The maintenance window is from 10AM to 5PM EDT on 9/11. During that time the track/upload and the track/profile API calls will be unavailable. We will post on this thread when maintenance is complete.
Apologies for the late notice and any inconvenience this causes.
-- Paul