[Enhancement]: Add support for AZ DNS Affinity on NLB

[ddericco]

Description

Add support for the recently announced Availability Zonal DNS affinity on Network Load Balancer (NLB)

Affected Resource(s) and/or Data Source(s)

• aws_lb

Potential Terraform Configuration

resource "aws_lb" "test" {
  name               = "test"
  dns_record_client_routing_policy = "availability_zone_affinity"
  internal           = true
  load_balancer_type = "network"

  subnet_mapping {
    subnet_id = aws_subnet.test[0].id
  }

  tags = {
    Name = "test"
  }
}

References

Launch announcement: https://aws.amazon.com/about-aws/whats-new/2023/10/aws-nlb-availability-performance-capabilities/
SDK: https://pkg.go.dev/github.com/aws/aws-sdk-go@v1.45.27/service/elbv2#LoadBalancerAttribute
API reference: https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_LoadBalancerAttribute.html

Would you like to implement a fix?

Yes

[github-actions]

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[github-actions]

This functionality has been released in v5.23.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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