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Lessons (8)

• Drift, Troubleshooting, and Disaster Recovery

  … Re-running blindly can create duplicates or naming conflicts. Respond to drift If someone changed a bucket tag …

• CI/CD and Reviewed Production Changes

  Design an automated plan and apply workflow with protected credentials, saved plans, serialization, and drift checks. A useful …

• DRY: Don't Repeat Yourself

  … one source of truth instead of many copies that drift apart](/img/clean-code/dry.svg) DRY = Don …

• GitOps, Progressive Delivery and Observability

  … full audit trail, easy rollback ( git revert ), drift correction, and no cluster credentials in CI. yaml apiVersion: argoproj …

• Design System Operations

  … A screenshot can catch spacing and color drift; it cannot prove that Escape closes a dialog or that …

• Time, Consistency and Distributed Transactions

  … system-design-l6/time-transactions.svg) Physical clocks drift, so never assume timestamps alone establish causality. Lamport clocks …

• Dependencies, Data Sources, and Resource Lifecycle

  … to another system; using it broadly can conceal drift. Use it only when ownership is explicitly shared, such …

• Production Capstone and Interview Practice

  … Add scheduled drift detection with explicit handling of exit code 2. Step 5: rehearse recovery and cleanup Change …