Final Status: Engineers identified a code regression in a recent update and corrected it, which mitigated impact.
User Impact: Affected users may have been unable to see updates to Group Information pages.
Customer Impact: Analysis of incident scope indicated that many customers appeared to be impacted by this event. For those customers affected, this issue potentially affected any user attempting to access the Group Information pages. Engineers received a few isolated customer reports of this issue.
Incident Start Time: Monday, November 30, 2015, at 11:14 PM UTC
Incident End Time: Tuesday, December 1, 2015, at 3:56 PM UTC
Preliminary Root Cause: A recently deployed update intended to improve code quality contained a code regression, which caused impact to the Yammer service.
Next Steps: The following is a list of known action item(s) associated with this incident. As part of the Office 365 problem management process, additional engineering actions may be identified to improve the overall service.
– Action: Review the infrastructure update process to prevent reoccurrences of this scenario.
Please consider this service notification the final update on the event.