This DOP-C02 practice question tests your understanding of monitoring and logging. 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 runs a containerized application on Amazon ECS Fargate. The DevOps team wants to collect custom application metrics (e.g., request count, error rate) and send them to Amazon CloudWatch. The team wants to minimize changes to the application code. Which solution should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run the CloudWatch agent as a sidecar container in the ECS task definition, configured to collect StatsD metrics from the application container.
Option B is correct because the CloudWatch agent can run as a sidecar container in the same ECS task definition and listen for StatsD metrics (over UDP port 8125) from the application container. This approach requires zero changes to the application code—the application simply emits StatsD-formatted metrics, and the CloudWatch agent forwards them to CloudWatch via the PutMetricData API. It minimizes operational overhead while enabling custom metric collection from containerized workloads on Fargate.
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.
✗
Have the application call the CloudWatch PutMetricData API directly.
Why it's wrong here
Incorrect: This requires code changes.
✓
Run the CloudWatch agent as a sidecar container in the ECS task definition, configured to collect StatsD metrics from the application container.
Why this is correct
Correct: The CloudWatch agent can collect StatsD metrics without code changes.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the ECS agent's built-in metric collection feature.
Why it's wrong here
Incorrect: The ECS agent collects only container-level metrics, not custom application metrics.
✗
Modify the application to send logs using the embedded metric format.
Why it's wrong here
Incorrect: This requires code changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the ECS agent or CloudWatch agent must be installed on the host, but in Fargate, the sidecar pattern is the only way to run the CloudWatch agent without modifying the application code.
Detailed technical explanation
How to think about this question
The CloudWatch agent sidecar uses the StatsD protocol (UDP port 8125) to receive metrics from the application container, which can emit metrics using any StatsD client library (e.g., DogStatsD, Etsy's StatsD). The agent aggregates metrics locally and flushes them to CloudWatch every 60 seconds by default, supporting dimensions and metric namespaces. In a Fargate task, both containers share the same network namespace, so the application can send UDP packets to localhost:8125 without any service discovery overhead.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run the CloudWatch agent as a sidecar container in the ECS task definition, configured to collect StatsD metrics from the application container. — Option B is correct because the CloudWatch agent can run as a sidecar container in the same ECS task definition and listen for StatsD metrics (over UDP port 8125) from the application container. This approach requires zero changes to the application code—the application simply emits StatsD-formatted metrics, and the CloudWatch agent forwards them to CloudWatch via the PutMetricData API. It minimizes operational overhead while enabling custom metric collection from containerized workloads on Fargate.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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