[Service Notice] 2015-09-20 UTC drop in success rate due to data service timeouts



Between 2015-09-20 19:39:00 UTC and 2015-09-20 20:08:00 UTC Twitter experienced substantial drop in the success rate of the Ads API.

During this time, the internal, underlying data service that powers the API experienced high latency and slow responses from the data backend causing API consumers to receive a high volume of request timeouts (503 SERVICE_UNAVAILABLE).

While the root cause is still under investigation, the system has since recovered and is currently back to normal operation.