All stages green except the production deploy, which failed three runs in a row. Nobody changed anything. Where do you dig first?

An unchanged pipeline failing in one environment means the environment moved, not the code. Failures that start on an expiry boundary narrow the field to two suspects fast.

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.

An unchanged pipeline failing in one environment means the environment moved, not the code. Failures that start on an expiry boundary narrow the field to two suspects fast.

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UP NEXT ON YOUR JOURNEY

Next in this trackA service on a VM dies and restarts every few minutes, and the team has shrugged for weeks. Find the actual cause.Next in this trackApps emit more log lines than the logging pipeline stores, and nothing alerts. Where do the missing events go?Next in this trackAfter moving a shared directory onto NFS, app threads pile into D state and load average tops 50 while CPUs sit idle. Explain it.

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