AWS cloudwatch cost issue

By default, many services provide free CloudWatch metrics for resources (such as Amazon EC2 instances, Amazon EBS volumes, and Amazon RDS DB instances). You can also enable detailed monitoring for some resources, such as your Amazon EC2 instances, or publish your own application metrics for an additional fee.

You could consider using the get-metric-statistics command to retrieve and see statistics based on the custom data points that you published.

More info on that is available at: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.html

To get a better estimate of CloudWatch custom metric pricing you can check out the AWS Pricing Calculator at https://calculator.aws/#/addService/CloudWatch

Finally - If you determine there is a custom metric you would like to remove, there is the delete-custom-metric command from the CLI.

https://docs.aws.amazon.com/cli/latest/reference/iot/delete-custom-metric.html