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You are deploying a critical application with a stateless, containerized (rented on Cloud Run and a Cloud SQL tor PostgreSQL backend The application experiences unpredictable traffic spikes, and the business requires the ability to immediately roll back a failed deployment to the last known good state You need to apply a deployment strategy that aligns with Site Reliability Engineering (SRE) principles for both the application code and the database schema updates, while meeting the business ' s requirements What should you do?
Correct Answer: C
In SRE (Site Reliability Engineering), the goal is to decouple components to reduce the " blast radius " of changes. * Separation of Concerns: Database schema migrations and application code should have separate pipelines (Option C). If a schema update is backward-compatible (a requirement for zero-downtime), the app can be rolled back independently. * Traffic Management: Cloud Run supports gradual traffic splitting , allowing you to send 5% of traffic to a new revision. If errors spike, you can immediately shift 100% of traffic back to the old revision. * Why not D? Running migrations on container startup is a common " anti-pattern " in large-scale systems because if 100 containers start at once, they might all try to modify the schema simultaneously, leading to lock contention or database corruption.