Azure outage post-mortem:
"The incident was initiated by an inadvertent tenant-level configuration change within the Azure Front Door service. This specific configuration was invalid and introduced an inconsistent state that the AFD runtime could not process correctly." [1]
So, a customer made a configuration change in their tenant, and that brought down the whole system. Wow. What a trainwreck.
[1] https://medium.com/@tahirbalarabe2/preliminary-post-incident-review-for-azure-front-door-service-disruption-06e6c026df2f
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