- A
Amazon CloudWatch Metrics for Lambda (duration, invocations)
Correct. Amazon CloudWatch Metrics for Lambda provides duration and invocations metrics, which are essential for analyzing performance trends and identifying slow invocations.
- B
AWS X-Ray to trace invocations and detect cold starts
Why wrong: Incorrect. While AWS X-Ray can detect cold starts, it is not necessary for this investigation because CloudWatch Metrics already provides duration data and CloudWatch Logs provides execution logs.
- C
AWS CloudTrail to record Lambda API calls
Why wrong: Incorrect. AWS CloudTrail records API calls made to Lambda, not the invocation performance or cold start data.
- D
Amazon CloudWatch Logs for Lambda execution logs
Correct. Amazon CloudWatch Logs for Lambda execution logs contains detailed log output from each invocation, which helps correlate performance issues with specific code execution.
- E
AWS Config to track Lambda configuration changes
Why wrong: Incorrect. AWS Config tracks configuration changes for Lambda functions, not performance or cold start information.
DOP-C02 Amazon CloudWatch Metrics for Lambda Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: amazon CloudWatch Metrics for Lambda. 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 DevOps engineer is investigating a performance issue in a serverless application using AWS Lambda. The engineer wants to view the duration of each invocation and identify cold starts. Which TWO AWS services should be used? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon CloudWatch Metrics for Lambda (duration, invocations)
Amazon CloudWatch Metrics for Lambda (option A) provides built-in metrics such as duration and invocations, which are essential for analyzing performance trends and identifying slow invocations. Amazon CloudWatch Logs for Lambda execution logs (option D) contains detailed log output from each invocation, including custom logs and Lambda runtime logs, which can help correlate performance issues with specific code paths. Together, these two services allow the engineer to view duration metrics and investigate individual invocations through logs. AWS X-Ray (option B) can also detect cold starts, but it is not required for this task since CloudWatch Metrics already provides duration data and CloudWatch Logs provides execution details. The marked correct answers are A and D.
Key principle: Amazon CloudWatch Metrics for Lambda
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amazon CloudWatch Metrics for Lambda (duration, invocations)
Why this is correct
Correct. Amazon CloudWatch Metrics for Lambda provides duration and invocations metrics, which are essential for analyzing performance trends and identifying slow invocations.
Related concept
Amazon CloudWatch Metrics for Lambda
- ✗
AWS X-Ray to trace invocations and detect cold starts
Why it's wrong here
Incorrect. While AWS X-Ray can detect cold starts, it is not necessary for this investigation because CloudWatch Metrics already provides duration data and CloudWatch Logs provides execution logs.
- ✗
AWS CloudTrail to record Lambda API calls
Why it's wrong here
Incorrect. AWS CloudTrail records API calls made to Lambda, not the invocation performance or cold start data.
- ✓
Amazon CloudWatch Logs for Lambda execution logs
Why this is correct
Correct. Amazon CloudWatch Logs for Lambda execution logs contains detailed log output from each invocation, which helps correlate performance issues with specific code execution.
Related concept
Amazon CloudWatch Metrics for Lambda
- ✗
AWS Config to track Lambda configuration changes
Why it's wrong here
Incorrect. AWS Config tracks configuration changes for Lambda functions, not performance or cold start information.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly choose AWS X-Ray (option B) because they believe it is necessary for detecting cold starts. However, CloudWatch Metrics for Lambda already provides the 'duration' metric, which can be filtered to identify cold starts (invocations with higher duration than typical warm invocations). Additionally, CloudWatch Logs (option D) contains execution logs that include initialization details. Therefore, the correct pair is Amazon CloudWatch Metrics and Amazon CloudWatch Logs, not X-Ray.
Detailed technical explanation
How to think about this question
Cold starts occur when Lambda initializes a new execution environment, adding a latency overhead that can be observed in X-Ray traces as an 'Init' segment before the function's 'Invocation' segment. CloudWatch Metrics aggregates duration across all invocations but does not separate cold start vs. warm start durations; X-Ray's per-trace view is required to isolate cold start events. The combination of CloudWatch Metrics for aggregate performance monitoring and X-Ray for granular, per-request diagnostics is the standard approach for Lambda performance troubleshooting.
KKey Concepts to Remember
- Amazon CloudWatch Metrics for Lambda
- Amazon CloudWatch Logs for Lambda
- Cold Start
- AWS X-Ray
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
Amazon CloudWatch Metrics for Lambda
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. Amazon CloudWatch Metrics for Lambda Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Review amazon CloudWatch Metrics for Lambda, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Monitoring and Logging — This question tests Monitoring and Logging — Amazon CloudWatch Metrics for Lambda.
What is the correct answer to this question?
The correct answer is: Amazon CloudWatch Metrics for Lambda (duration, invocations) — Amazon CloudWatch Metrics for Lambda (option A) provides built-in metrics such as duration and invocations, which are essential for analyzing performance trends and identifying slow invocations. Amazon CloudWatch Logs for Lambda execution logs (option D) contains detailed log output from each invocation, including custom logs and Lambda runtime logs, which can help correlate performance issues with specific code paths. Together, these two services allow the engineer to view duration metrics and investigate individual invocations through logs. AWS X-Ray (option B) can also detect cold starts, but it is not required for this task since CloudWatch Metrics already provides duration data and CloudWatch Logs provides execution details. The marked correct answers are A and D.
What should I do if I get this DOP-C02 question wrong?
Review amazon CloudWatch Metrics for Lambda, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Amazon CloudWatch Metrics for Lambda
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Last reviewed: Jun 24, 2026
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