Treat multi‑region "all regions healthy" as an incomplete success criterion…
Treat multi‑region "all regions healthy" as an incomplete success criterion: your app can be isolated by network partitions or third‑party control‑plane failures even when every region reports healthy. You should start resilience work by listing external services whose failure would leave the app unreachable or unable to operate despite regional health. Prioritize those with the largest blast radius and build fallbacks or out‑of‑band plans for them.
When Submarine Cables Go Dark: Understanding and Preparing for the Risks of Taiwan's International Internet Disconnection
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