Edit February 26, 2018: We have just posted an updated and complete postmortem here: https://devblogs.microsoft.com/devopsservice/?p=16295

Customer Impact
On 7 February 2018 we had an incident which impacted users in our Western European scale unit. During this time, users experienced slow performance and 503 errors (service unavailable) when interacting with VSTS services. … Continue reading Preliminary Postmortem: Performance Issues and failures in VSTS West Europe – 7 February 2018