Timeline:

2018-03-29 21:30 UTC: A portion of Cloud and Enterprise Agents began reporting 'No Data'

2018-03-29 22:30 UTC: Root cause of the service degradation was identified and fixed

2018-03-29 23:08 UTC: Data processing pipeline finished processed all pending test results

Customer Impact: During the window of time indicated in the timeline, some customers may seen 'No Data' for test results. All missing data would have been cached on the Agents until submitted to the collector. We don't expect any data to have been lost during this time. For affected tests Alert Rules would not have been processed during the event.