resourceArn

The ARN of the CloudWatch resource that you're adding tags to.

The ARN format of an alarm is arn:aws:cloudwatch:<i>Region</i>:<i>account-id</i>:alarm:<i>alarm-name</i>

The ARN format of a Contributor Insights rule is arn:aws:cloudwatch:<i>Region</i>:<i>account-id</i>:insight-rule/<i>insight-rule-name</i>

For more information about ARN format, see Resource Types Defined by Amazon CloudWatch in the Amazon Web Services General Reference.