User Story:

As a (user persona), I want to the DNS query for the private hostname of cluster nodes to return AAAA record with ec2 instance's IPv6.

Currently, if ec2 uses IP-based hostnames, AWS only returns the IPv4 A record. Thus, we need to use resource name to enable AAAA records for DNS queries. 

Acceptance Criteria:

Description of criteria:

• EC2 instances for cluster nodes have:
  • hostNametype: resource-name
  • enableResourceNameDnsAAAA: true
• CAPA allows such configurations in awsmachinetemplate.spec.template.spec.privateDnsName field.

(optional) Out of Scope:

Detail about what is specifically not being delivered in the story

Engineering Details:

• RBN for ec2 instance is available on AWS as of today. The original post can be referenced here.
• CAPA AWSMachine field: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/570bb5ebc6bf26ff0efd29a12f2483870f37daac/api/v1beta2/types.go#L473-L484

This requires/does not require a design proposal.
This requires/does not require a feature gate.