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Cloud SDK calls across the fleet start failing with expired credentials during a traffic spike. Nothing expired. Explain it.

Every SDK fetches its credentials from a link-local metadata endpoint with a modest request budget. Enough containers refreshing at once and the endpoint starts refusing, which the SDK reports as an auth problem.

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.

Every SDK fetches its credentials from a link-local metadata endpoint with a modest request budget. Enough containers refreshing at once and the endpoint starts refusing, which the SDK reports as an auth problem.

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