Autonomous Web Pipeline Ran Flawlessly for 12 Hours While Silently Failing

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A development team built a fully automated overnight website production pipeline that processes up to 40 projects per night with no human intervention, using staged steps for image preparation, production, and verification. One night, the publishing step failed silently — without throwing errors or corrupting exit codes — leaving nearly 11,000 newly generated site files undeployed. The external verification system still returned HTTP 200 responses and passed all checks, because the previous day's live version remained online and looked correct. All monitoring indicators showed green for 12 hours before the team discovered the failure. The key lesson drawn was that a zero exit code and passing health checks only confirm a system is running, not that it has actually delivered fresh output — true verification must come from a source independent of the production system itself.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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