Everyone Assumes Manual Scaling Works Until It Doesn’t: What 99.999999999% Durability Actually Tells You

https://www.bust-bookmark.win/seasonal-traffic-spikes-when-s3-bucket-policies-beat-iam-roles-and-when-they-don-t

When an Engineering Team Learned the Hard Way That Durability Isn't a Free Pass Maria, the infrastructure lead at a mid-stage SaaS company, woke up to 2 a.m. alerts. The customer-facing API was returning 500 errors for a subset of customers