Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 341 discussion

CloudWatch metric streams are designed specifically to stream metric data in near real-time to destinations like Firehose. Selecting "all metrics" ensures that any new metrics added in the future are automatically included, satisfying the requirement to "automatically collect any new metrics." Amazon Kinesis Data Firehose supports Lambda transforms, so the analytics team can modify data before it's delivered. Output to S3 is natively supported by Firehose, which satisfies the storage requirement.

B is better than A because new metrics must be automatically collected. With A they have to be manually selected. With B they are automatically collected.

Why not option B? Just collect all the metrics in the namespace, if new ones are added later, it will also be collected

A is correct

Explanation: The requirements are: 1. Collect performance metrics and custom metrics from CloudWatch. 2. Automatically include new metrics added to the namespace. 3. Transform the metrics data. 4. Store the transformed data in an S3 bucket. 5. Minimize operational overhead. Option A: Configure a CloudWatch metric stream to include metrics from the application and the CloudWatch namespace. Configure the metric stream to deliver the metrics to an Amazon Data Firehose delivery stream. Configure the Firehose delivery stream to invoke an AWS Lambda function to transform the data. Configure the delivery stream to send the transformed data to the S3 bucket.