labelTemplate
Specify a friendly human-readable name to use to identify this source account when you are viewing data from it in the monitoring account.
You can use a custom label or use the following variables:
$AccountNameis the name of the account$AccountEmailis the globally unique email address of the account$AccountEmailNoDomainis the email address of the account without the domain name
In the Amazon Web Services GovCloud (US-East) and Amazon Web Services GovCloud (US-West) Regions, the only supported option is to use custom labels, and the $AccountName, $AccountEmail, and $AccountEmailNoDomain variables all resolve as account-id instead of the specified variable.