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What is the primary operational advantage of the 'Expand and Contract' database migration pattern during enterprise production deployments?

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advanced 45 min

Day 19: Deploy with CI, Configuration, and Rollback

Deploy with CI, Configuration, and Rollback

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Inspect the canary health monitor function below. Under what condition does the deployment controller automatically abort the release and roll back traffic?

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At 07:15 AM, fifteen minutes into morning shift rollout, Northstar's canary build triggers a p95 latency spike to 4.2 seconds due to an unindexed query on historical loads. Dispatchers report sluggish triage screens. What is the correct on-call engineering action?

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