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Answer: Create a CloudWatch Logs metric filter that counts the number of times that the web server returns an HTTP 404 response.
CloudWatch Logs metric filters provide the most operationally efficient way to extract metrics from log data. You can define a pattern to search for specific terms (like HTTP 404) and increment a metric automatically. This removes the need for custom scripts, Lambda functions, or dealing with subscriptions.
Author: Ritesh Yadav
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Question #25
A company hosts a web application on an Amazon EC2 instance. The web server logs are published to Amazon CloudWatch Logs. The log events have the same structure and include the HTTP response codes that are associated with the user requests. The company needs to monitor the number of times that the web server returns an HTTP 404 response.
What is the MOST operationally efficient solution that meets these requirements?
A
Create a CloudWatch Logs metric filter that counts the number of times that the web server returns an HTTP 404 response.
B
Create a CloudWatch Logs subscription filter that counts the number of times that the web server returns an HTTP 404 response.
C
Create an AWS Lambda function that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
D
Create a script that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
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