Your organization requires real-time automated remediation of infrastructure configuration drift across its Google Cloud projects. Specifically, whenever a storage bucket or resource IAM policy is modified to grant public access, an automated Python remediation script must execute immediately to evaluate the change and revert non-compliant IAM bindings. Which architecture should you implement to deploy and trigger this event-driven remediation script with minimal operational overhead and latency?

Deploy the Python remediation script to Cloud Run functions using `gcloud run deploy` and configure an Eventarc trigger to route Cloud Audit Log events directly to the function.: ### What Cloud Run functions with Eventarc triggers are **Cloud Run functions** (formerly Cloud Functions 2nd gen) provide a lightweight, event-driven serverless execution environment powered by **Cloud Run**. Combined with **Eventarc**, it enables developers to route events from over 130+ Google Cloud sources—including **Cloud Audit Logs** and **Cloud Pub/Sub**—directly to containerized or function-based runtimes without managing persistent infrastructure. ### How it meets the requirements - **Real-Time Remediation**: Captures configuration changes immediately as **Cloud Audit Log** events occur when API operations mutate IAM policies or resource settings. - **Event-Driven and Serverless**: The Python script executes on demand upon event arrival, scaling to zero when idle and instantly scaling up under bursts of compliance drift events. - **Minimal Latency & Overhead**: Native Eventarc routing delivers audit log events directly to the HTTP entry point of the Cloud Run function without requiring custom polling daemons or complex routing middleware. ### Key advantages - **Declarative Deployment**: Deployed easily using `gcloud run deploy --function ...` or via Infrastructure as Code (IaC). - **Standardized CloudEvents Format**: Receives standardized payloads adhering to the **CloudEvents** specification, making it straightforward to parse resource names, principal identities, and altered permissions. - **Granular Event Filtering**: Allows filtering on specific Google Cloud API methods (e.g., `storage.setIamPermissions`). - **Built-in Resilience**: Offers integrated retry policies and dead-letter queue configurations through underlying Pub/Sub transport. ### Why this is optimal This architecture directly couples event detection with serverless execution. Compared to scheduled polling or self-managed VMs, it guarantees sub-second response times for security remediation while maintaining zero baseline compute costs.