High Availability Is Not Resilience: Why Cloud Systems Fail When It Matters Most

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Posted on Thu Oct 1 2026 | 2:30 pm

A routine TLS 1.3 upgrade silently broke Route 53 health checks, causing a CDN to stop routing traffic to a healthy region while internal dashboards showed nothing wrong. This article examines why HA and resilience are different problems, how control-plane dependencies create invisible failure modes, and why recovery capability erodes without explicit ownership.

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