A deployed App Engine update causes ~30s load times for some users whereas prior releases were fine. What remediation strategy should you take?
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Correct answer: Roll back to an earlier known good release initially, then use Stackdriver Trace and Logging to diagnose the problem in a development/test/staging environment.
Why this is the answer
The immediate priority for production issues impacting user experience is to restore service quickly. Rolling back to a known good release minimizes downtime and user impact. Once service is restored, you can then safely diagnose the root cause in a non-production environment using tools like Stackdriver Trace for latency analysis and Stackdriver Logging for error details. Working with an ISP is unlikely to resolve an application-specific performance issue. Opening a support ticket for network data is too slow for an immediate production incident. Pushing the release again at a quieter period without prior diagnosis risks reintroducing the problem and further impacting users.
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