The answer is that the alarm shows INSUFFICIENT_DATA because the instances are not sending CPU utilization metrics to CloudWatch, often due to a missing CloudWatch agent or insufficient IAM permissions. This occurs because CloudWatch requires metric data points to evaluate an alarm against its threshold and period; without any data, it cannot determine if CPU exceeds 80% for five consecutive minutes, so it defaults to INSUFFICIENT_DATA rather than ALARM or OK. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of the metric data flow from EC2 instances to CloudWatch, especially when Auto Scaling is involved—a common trap is assuming the alarm period is the issue when it’s actually a data collection failure. Remember that INSUFFICIENT_DATA always points to missing metrics, not misconfigured thresholds. Memory tip: “No data, no state—INSUFFICIENT_DATA means the metric’s late.”
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 SysOps administrator sets up an alarm to monitor the CPU utilization of an Auto Scaling group. The alarm should trigger a scaling policy when CPU exceeds 80% for 5 consecutive minutes. The alarm state remains 'INSUFFICIENT_DATA' even though instances are running. Which THREE are possible causes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The EC2 instances are not sending CPU utilization metrics to CloudWatch.
Option A is correct because if EC2 instances are not sending CPU utilization metrics to CloudWatch, the alarm will remain in INSUFFICIENT_DATA state. This can happen if the CloudWatch agent is not installed or configured on the instances, or if the instances lack the necessary IAM permissions to publish metrics. Without metric data, CloudWatch cannot evaluate the alarm condition.
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.
✓
The EC2 instances are not sending CPU utilization metrics to CloudWatch.
Why this is correct
If the CloudWatch agent is not installed or configured, no metrics are sent.
Related concept
Read the scenario before looking for a memorised answer.
✓
The alarm is configured with the wrong metric namespace.
Why this is correct
If the namespace is incorrect, CloudWatch cannot find the metric data.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Auto Scaling group does not have a health check grace period configured.
Why it's wrong here
Health check grace period does not affect metric data availability.
✓
The alarm's period is shorter than the evaluation period.
Why this is correct
If the period is 1 minute and evaluation periods is 5, there may be insufficient data after startup.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Auto Scaling group uses ELB health checks.
Why it's wrong here
ELB health checks are unrelated to CloudWatch metric collection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume INSUFFICIENT_DATA is always due to missing metrics, but they overlook misconfigured namespaces or mismatched period/evaluation windows as equally valid causes.
Detailed technical explanation
How to think about this question
CloudWatch alarms rely on metric data points being published to a specific namespace (e.g., AWS/EC2 for basic monitoring or CWAgent for custom metrics). If the metric namespace is incorrect (Option B), the alarm looks for data in the wrong place, resulting in INSUFFICIENT_DATA. Additionally, if the alarm's period (e.g., 1 minute) is shorter than the evaluation period (e.g., 5 minutes), the alarm may not have enough data points to evaluate, especially if metrics are published less frequently (e.g., 5-minute basic monitoring), leading to INSUFFICIENT_DATA.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: The EC2 instances are not sending CPU utilization metrics to CloudWatch. — Option A is correct because if EC2 instances are not sending CPU utilization metrics to CloudWatch, the alarm will remain in INSUFFICIENT_DATA state. This can happen if the CloudWatch agent is not installed or configured on the instances, or if the instances lack the necessary IAM permissions to publish metrics. Without metric data, CloudWatch cannot evaluate the alarm condition.
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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