The correct answer is to install the CloudWatch agent on the EC2 instances to collect memory metrics and publish them to CloudWatch. This is because default EC2 monitoring only captures hypervisor-level metrics like CPU and network, not in-guest memory usage; the CloudWatch agent is the only native AWS tool that can collect detailed memory utilization from inside the operating system and send it as custom metrics. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of the difference between basic/detailed EC2 monitoring and the CloudWatch agent, with a common trap being that enabling detailed monitoring alone still won’t capture memory data. The agent allows you to set a 1-minute collection interval, and while CloudWatch retains 1-minute metrics for 15 days by default, you can extend retention to 30 days cost-effectively using a custom metric retention policy. Memory tip: remember that “EC2 monitors the host, the agent monitors the guest.”
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is running a critical application on Amazon EC2 instances. The application performance has degraded over the past week. The SysOps administrator suspects a memory leak. The administrator needs to collect detailed memory usage metrics every minute and store them for 30 days. Which solution is the MOST cost-effective and operationally efficient?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Install the CloudWatch agent on the EC2 instances to collect memory metrics and publish them to CloudWatch.
Option D is correct because the CloudWatch agent is specifically designed to collect custom metrics like memory utilization from EC2 instances, which are not available through default or detailed EC2 monitoring. By installing the agent and configuring it to publish memory metrics to CloudWatch every minute, the administrator can meet the requirement for 1-minute granularity and 30-day retention cost-effectively, as CloudWatch retains metric data at 1-minute resolution for 15 days by default, but can be extended to 30 days via a custom metric retention setting.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use AWS CloudTrail to log memory usage and store the logs in Amazon S3.
Why it's wrong here
CloudTrail records API calls, not system metrics.
✗
Enable default EC2 monitoring to collect memory metrics every 5 minutes.
Why it's wrong here
Default EC2 monitoring does not collect memory metrics.
✗
Enable detailed monitoring on the EC2 instances to collect memory metrics every 1 minute.
Why it's wrong here
Detailed monitoring provides 1-minute metrics for CPU, disk, and network, but not memory.
✓
Install the CloudWatch agent on the EC2 instances to collect memory metrics and publish them to CloudWatch.
Why this is correct
The CloudWatch agent can collect memory metrics and publish them as custom metrics with 1-minute resolution.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse detailed EC2 monitoring (which only covers hypervisor-level metrics) with in-guest monitoring, assuming that enabling detailed monitoring will capture memory usage, but memory is a guest OS metric that requires the CloudWatch agent.
Detailed technical explanation
How to think about this question
The CloudWatch agent uses the CollectD protocol or the StatsD plugin to gather memory metrics from the guest OS, such as `mem_used_percent` and `mem_available`, and publishes them as custom metrics via the CloudWatch PutMetricData API. Unlike EC2 metrics, which are stored in the AWS/EC2 namespace, custom memory metrics are stored in the CWAgent namespace and can be retained for longer periods (up to 455 days) by adjusting the retention policy. In a real-world scenario, a memory leak would manifest as a gradual increase in `mem_used_percent` over time, which can be visualized in a CloudWatch dashboard to trigger an alarm.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Install the CloudWatch agent on the EC2 instances to collect memory metrics and publish them to CloudWatch. — Option D is correct because the CloudWatch agent is specifically designed to collect custom metrics like memory utilization from EC2 instances, which are not available through default or detailed EC2 monitoring. By installing the agent and configuring it to publish memory metrics to CloudWatch every minute, the administrator can meet the requirement for 1-minute granularity and 30-day retention cost-effectively, as CloudWatch retains metric data at 1-minute resolution for 15 days by default, but can be extended to 30 days via a custom metric retention setting.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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