Which of the following requires a custom CloudWatch metric to monitor?
A.
Memory Utilization of an EC2 instance
B.
CPU Utilization of an EC2 instance
C.
Disk usage activity of an EC2 instance
D.
Data transfer of an EC2 instance
Explanation:
http://arr.gr/blog/2013/08/monitoring-ec2-instance-memory-usage-with-cloudwatch/
A. Because CloudWatch doesn’t have matric for memory utilization
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It does have a “Freeable Memory” metric for RDS. The key in this question is that it is specific to EC2.
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Correct answer is A
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A
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).
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The simple answer is that to monitor memory for an EC2 instance you must create a custom metric as it does not come set up by default.
A
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A
However, there’s one big missing feature in CloudWatch: it doesn’t monitor your instance memory utilization
http://arr.gr/blog/2013/08/monitoring-ec2-instance-memory-usage-with-cloudwatch/
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