Amazon CloudWatch is AWS's monitoring service that collects and tracks metrics, monitors log files, sets alarms, and automatically reacts to changes in AWS resources. It is specifically designed to monitor operational metrics like CPU utilization, latency, disk I/O, and other performance indicators for services such as EC2, RDS, and other AWS resources.

• AWS CloudTrail is for auditing API calls and user activity
• AWS Config is for resource inventory and configuration history
• AWS Trusted Advisor provides best practice recommendations for cost optimization, security, fault tolerance, and performance improvement