physicalResourceId

The name or unique identifier that corresponds to a physical instance ID of a resource supported by CloudFormation.

For example, for an Amazon Elastic Compute Cloud (EC2) instance, PhysicalResourceId corresponds to the InstanceId. You can pass the EC2 InstanceId to DescribeStackResources to find which stack the instance belongs to and what other resources are part of the stack.

Required: Conditional. If you don't specify PhysicalResourceId, you must specify StackName.