On Monday morning, around 7am London time, a power event hit one zone of Google Cloud's London region. Not the whole region. One zone out of three. And for the next eight hours, Revolut card payments
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One addition to the checklist: a replica set across zones is not a backup. A bad deploy or an accidental delete will replicate to the other zones just as fast. Keep a separate, tested restore outside that replica set.
The zonal-defaults point is the sneaky one for a zonal GKE cluster or a single VM. Cloud Run cuts the other way though: per Google's resource model docs, regional services replicate across zones automatically, so a default deploy is already multi-zone.
Julian Neagu
500+ AI tools shipped solo. Founder of VisionVix.
The fallback point hits home. Most apps are built for the happy path, then one service goes down and everything starts piling up. Returning something useful beats showing a 500.