A Multinational bank uses Amazon CloudWatch logs to capture logs from the Amazon EC2 instance on which a critical banking application is deployed. The operations team has created a metric filter for filtering error messages from the logs captured. But intermittently, they are observing no data is getting reported. The Operation Lead has instructed us to check the setting of the metric filters.
What setting can be done with metric filters to resolve this issue?

Answer options:

A.Set Default Value in the metric filter as 0.
B.Set dimensions value in the metric filter as 0.
C.Set metric value in the metric filter as 0.
D.Set filter pattern in the metric filter as 0.

Correct Answer: A
Default Value is the value reported when no matching logs are found with a metric filter. By setting Default Value as 0, metric data can always be reported, even if there are no matching metric filters with the captured logs.
Option B is incorrect as dimensions are the key value pair that defines the metric.
Option C is incorrect as this is a metric value based upon matching criteria in the log file.
Option D is incorrect as the filter pattern is the pattern that is specified to match in the log file.
For more information on metric filters with Amazon CloudWatch logs, refer to the following URL,
https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/MonitoringLogData.html