REL 5. How are you monitoring AWS resources?
Logs and metrics are a powerful tool for gaining insight into the health of your applications. You can configure your system to monitor logs and metrics and send notifications when thresholds are crossed or significant events occur. Ideally, when low-performance thresholds are crossed or failures occur, the system will have been architected to automatically self-heal or scale in response.
Best practices:
 Monitoring Monitor your applications with Amazon CloudWatch or third-party tools.
 Notification Plan to receive notifications when significant events occur.
 Automated Response Use automation to take action when failure is detected, e.g., to replace failed components.
 Review Perform frequent reviews of the system based on significant events to evaluate the architecture.