Final Status: Engineers have completed the deployment of the fix and verified that service is now restored.
User Impact: The affected users may have received errors or experienced degraded functionality when accessing the Yammer service.
Scope of Impact: Many customers likely had users experiencing impact related to this event. Engineers received a few isolated customer reports of this issue.
Incident Start Time: Friday, April 15, 2016, at 2:00 AM UTC
Incident End Time: Friday, April 15, 2016, at 9:51 PM UTC
Preliminary Root Cause: An update was deployed to the Yammer infrastructure; however, the update caused a code issue that resulted in service impact.
– Review procedures for validating service updates as the code issue that caused impact was not identified during the testing phase of the development process.