PERF 3. How do you monitor your instances post-launch to ensure they are performing as expected?
System performance can degrade over time due to internal and/or external factors. Monitoring the performance of systems allows you to identify this degradation and remediate internal or external factors (such as the OS or application load).

 

Best practices:
 Amazon CloudWatch monitoring Use CloudWatch to monitor instances.
 Third-party monitoring Use third-party tools to monitor systems.
 Periodic review Periodically review your monitoring dashboards.
 Alarm-based notifications Receive an automatic alert from your monitoring systems if metrics are out of safe bounds.
 Trigger-based actions Alarms cause automated actions to remediate or escalate issues.