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You are the cloud architect for a team developing a new application that integrates with the Gemini API. You observe a sudden, massive spike in API costs and usage. An investigation reveals that a developer accidentally committed a service account key with Gemini API access to a public GitHub repository, and a malicious actor is using it. The on-call SRE immediately disabled the key, stopping the unauthorized usage. Your responsibility is to lead the post-incident review to prevent future credential leaks. What should you do?
Correct Answer: D
Site Reliability Engineering (SRE) and DevOps best practices state that post-incident reviews must be blameless. Punitive actions create an environment of fear, which can lead to teams hiding mistakes and delaying incident resolution. A constructive postmortem focuses on uncovering systemic systemic failures within tools, workflows, and guardrails rather than assigning individual blame. The primary goal of this review is to identity security gaps and implement automated preventative guardrails. This involves adding secret detection tools (e.g., GitGuardian or TruffleHog) directly into development workflows using pre-commit hooks, as well as adding static analysis security testing (SAST) scanning stages into remote CI/CD deployment pipelines. This architecture catches exposed service keys or credentials before code changes are merged into public repositories, mitigating risk through automated technical controls. References: Cloud Architect (GCP) Study Guide topics: " Google SRE Culture and Blameless Postmortems " , " Secret Management Best Practices " , " Securing CI/CD Pipelines " , and " Credential Leak Mitigation " .