A plain-English summary of the Oct 20 us-east-1 outage: a DynamoDB DNS automation bug cascaded into EC2 launches, NLB health checks, and higher-level services. What failed, how AWS fixed it, and practical resiliency takeaways for builders.
Chasing “five nines” sounds heroic, but every extra nine slashes downtime while exploding cost and complexity. This post translates nines into real minutes, shows why the next nine often isn’t worth it, and walks through setting solid SLOs with error budgets. We share a quick ROI model, vendor-SLA gotchas, and practical ways to raise reliability—graceful degradation, safer deploys, and drills—so you buy the reliability your users feel, not vanity nines.
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