Every PR merged green, yet main breaks twice a week. What does introducing a merge queue actually change?

Green PRs can still break main because they were validated against a stale tip. Merge queues revalidate the exact combination that lands, trading latency for certainty.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Green PRs can still break main because they were validated against a stale tip. Merge queues revalidate the exact combination that lands, trading latency for certainty.

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