Final answer:
CloudWatch can obtain Network In and Out, CPU Usage, and Disk Reads and Writes metrics directly from an EC2 instance without needing CWAgent installed.
Step-by-step explanation:
CloudWatch can retrieve the following metrics from an EC2 instance without needing CWAgent installed:
- Network In and Out: CloudWatch can monitor the incoming and outgoing network traffic on an EC2 instance, measuring the number of bytes sent and received.
- CPU Usage: CloudWatch can track the amount of CPU utilization on an EC2 instance, helping monitor the workload and performance.
- Disk Reads and Writes: CloudWatch can measure the number of disk read and write operations on an EC2 instance, helping monitor the I/O activity.
However, Memory Utilization is not a metric that can be obtained by CloudWatch from an EC2 instance without CWAgent installed.