Design for region failure. Active/passive and active/active, data replication, and failover testing.
Single-region risk is high. Multi-region design improves availability and disaster recovery.
Multi-region adds cost and complexity; start with critical paths and expand.
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We've run canary deploys on most services for two years. The mechanics are easy; the metrics that decide "promote or roll back" are where the design is.
We track the four DORA metrics plus a handful of others. The trade-off between what's measurable and what's meaningful, and how we use the numbers.
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A practitioner's guide to choosing between serverless and provisioned databases based on cost, latency, connections, and load shape.
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