Amazon Exam DOP-C02 Topic 3 Question 47 Discussion

Actual exam question for Amazon's DOP-C02 exam

Question #: 47
Topic #: 3

A company has a mobile application that makes HTTP API calls to an Application Load Balancer (ALB). The ALB routes requests to an AWS Lambda function. Many different versions of the application are in use at any given time, including versions that are in testing by a subset of users. The version of the application is defined in the user-agent header that is sent with all requests to the API.

After a series of recent changes to the API, the company has observed issues with the application. The company needs to gather a metric for each API operation by response code for each version of the application that is in use. A DevOps engineer has modified the Lambda function to extract the API operation name, version information from the user-agent header and response code.

Which additional set of actions should the DevOps engineer take to gather the required metrics?

AModify the Lambda function to write the API operation name, response code, and version number as a log line to an Amazon CloudWatch Logs log group. Configure a CloudWatch Logs metric filter that increments a metric for each API operation name. Specify response code and application version as dimensions for the metric.

BModify the Lambda function to write the API operation name, response code, and version number as a log line to an Amazon CloudWatch Logs log group. Configure a CloudWatch Logs Insights query to populate CloudWatch metrics from the log lines. Specify response code and application version as dimensions for the metric.

CConfigure the ALB access logs to write to an Amazon CloudWatch Logs log group. Modify the Lambda function to respond to the ALB with the API operation name, response code, and version number as response metadata. Configure a CloudWatch Logs metric filter that increments a metric for each API operation name. Specify response code and application version as dimensions for the metric.

DConfigure AWS X-Ray integration on the Lambda function. Modify the Lambda function to create an X-Ray subsegment with the API operation name, response code, and version number. Configure X-Ray insights to extract an aggregated metric for each API operation name and to publish the metric to Amazon CloudWatch. Specify response code and application version as dimensions for the metric.

Show Suggested Answer

Suggested Answer: A

'Note that the metric filter is different from a log insights query, where the experience is interactive and provides immediate search results for the user to investigate. No automatic action can be invoked from an insights query. Metric filters, on the other hand, will generate metric data in the form of a time series. This lets you create alarms that integrate into your ITSM processes, execute AWS Lambda functions, or even create anomaly detection models.' https://aws.amazon.com/blogs/mt/quantify-custom-application-metrics-with-amazon-cloudwatch-logs-and-metric-filters/

by Margurite at Apr 07, 2025, 10:48 AM

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Earleen

20 days ago

Haha, 'response metadata'? That sounds like a great way to confuse everyone. I'd steer clear of that one!

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Arlen

21 days ago

Wait, did you say 'response metadata'? I think I'd rather go with an option that doesn't involve that. Yikes!

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Nieves

22 days ago

Option A seems a bit too manual for my liking. I'd prefer a more automated solution like B or D.

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Edelmira

24 days ago

I don't know, I'm leaning towards C. Getting the data directly from the ALB access logs and then using a metric filter seems like the simplest option.

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Audry

7 days ago

I think C could work, but D might provide more detailed insights.

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2 months ago

I think option A is the best choice. Writing logs to CloudWatch Logs and using metric filters seems like a straightforward way to gather the required metrics.

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