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Which of the following characters is not allowed while creating a Namespace for a CloudWatch metric?
A. /
B. :
C. #
D. @
Correct Answer: D
Explanation/Reference:
Namespace is a grouping or a container for a CloudWatch metric. The names must be valid XML characters, typically containing the alphanumeric characters “0- 9A-Za-z” plus “.”(period), “-” (hyphen), “_” (underscore), “/” (slash), “#” (hash), and “:” (colon). All AWS namespaces follow the convention AWS/, such as AWS/EC2 and AWS/ELB.
Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html
