Exam AWS Certified Solutions Architect - Professional topic 1 question 994 discussion

Answer isA

The answer is A. The correct answer is don't do this. You will be charged for a custom metric per user. Let's say you have 10k users at $0.30 per custom metric you will be charged $3k. There are definitely cheaper ways to do this. https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/FilterAndPatternSyntaxForMetricFilters.html#logs-metric-filters-dimensions

With least privilege we can achieve the desried result. Coudwatch has the capability to create filter.

Correct A.

The solution that will provide the information with the LEAST change to the application is A. Configure an Amazon CloudWatch Logs metric filter that saves each successful login as a metric. Configure the user name and client name as dimensions for the metric. This solution does not require any changes to the application logic. The CloudWatch Logs metric filter will extract the user name and client name from the log file and save them as dimensions for the metric. This information can then be used to calculate the number of unique users each client has on a daily basis, weekly basis, and monthly basis. The other solutions require changes to the application logic or the deployment of additional AWS services. For example, solution B requires the application to make a call to the AWS SDK to increment a custom metric. Solution C requires the CloudWatch agent to be configured to extract successful login metrics from the logs. Solution D requires an AWS Lambda function to be deployed to consume the application logs.

With least efforts

Create new metric from cloudwatch logs directly.