Google fully explains what caused Monday’s multi-service outage – 9to5Google

Google started the week with a big outage that took down Gmail, Drive, and all other Workspace apps. As promised, Google now has a detailed explanation on the outage and steps it will take to prevent future incidents.
At a high level, the issue relates to existing work updating Google’s account authentication system. As the effort was ongoing, previous components were “left in place.” While keeping those older aspects resulted in an error about usage being at 0, Google instituted a grace period…

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