A friendly name or description for the metrics for this Rule.
The name can contain only alphanumeric characters (A-Z, a-z, 0-9), with
maximum length 128 and minimum length one. It can't contain whitespace or
metric names reserved for AWS WAF, including "All" and "Default_Action." You
can't change MetricName after you create the Rule.
A unique identifier for a Rule. You use RuleId to
get more information about a Rule (see GetRule), update
a Rule (see UpdateRule), insert a Rule into
a WebACL or delete a one from a WebACL (see
UpdateWebACL), or delete a Rule from AWS WAF (see
DeleteRule).