Term Kind Topic What it is
Correlated Region Failure Shared-Fate Region Dependency, Region Failure Correlation concept Single vs Multi-Region The shared dependencies that make two regions fail together, which is why multiplying regions multiplies cost but adds far less availability than independence arithmetic predicts.
Region Selection Criteria practice Single vs Multi-Region The factors determining where workloads run, in which data residency and latency usually dominate cost.
Region Strategy practice Single vs Multi-Region How many regions, where, and in what topology — driven by residency, latency and availability requirements rather than by ambition.