Which of the following requires a custom CloudWatch metric to monitor?
Memory Utilization of an EC2 instance
CPU Utilization of an EC2 instance
Disk usage activity of an EC2 instance
Data transfer of an EC2 instance
CloudWatch relies on the information provided by this hypervisor, which can only see the most hardware-sided
part of the instance’s status, including CPU usage (but not load), total memory size (but not memory usage),
number of I/O operations on the hard disks (but not it’s partition layout and space usage) and network traffic
(but not the processes generating it).