What does real zero-downtime deployment require?

Health checks for true readiness, graceful shutdowns, LB draining, fast rollbacks, and SLI monitoring during rollouts — error rate under 0.1%.

How do I measure zero downtime in production?

Track error rates and latency in five-minute deploy windows via observability tools like Honeycomb or Prometheus. Alert on spikes.

Are Kubernetes rolling updates actually zero downtime?

No — not without custom probes, draining, and metrics. They mask failures unless you tune hard.

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87% of Teams Boast Zero-Downtime Deploys—Error Spikes Tell Another Story

Engineering teams love bragging about zero-downtime deployments. But a 2023 observability survey shows 87% still see error rates balloon 400% mid-rollout. Here's the unvarnished truth.

DevTools Feed Apr 03, 2026 4 min read 11 views

Line graph of error rate spikes during a claimed zero-downtime deployment rollout

⚡ Key Takeaways

87% of 'zero-downtime' claims fail under SLI scrutiny during rollouts. 𝕏
Real readiness demands app-level health checks, not just process starts. 𝕏
Measure error rates <0.1% in deploy windows — staging first, prod always. 𝕏

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Originally reported by dev.to

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