Usage
$ ruby get_value_from_cloudwatch.rb --help
Usage: get_value_from_cloudwatch [options]
--endpoint=VAL default:us-east-1, us-east-1/us-west-2/us-west-1/eu-west-1/ap-southeast-1/ap-southeast-2/ap-northeast-1/sa-east-1
--namespace=VAL
--metric-name=VAL
--no-exist-dimensions
--dimension=VAL format:: or ~