resourceArn

The Amazon Resource Name (ARN) of the CloudWatch resource that you want to set tags for.

The ARN format of an Application Signals SLO is arn:aws:cloudwatch:<i>Region</i>:<i>account-id</i>:slo:<i>slo-name</i>

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