Support new ALB-type target_type for Target Groups

[robinsummerhill]

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Description

AWS introduced new ALB-type Load Balancer Target Groups on 2021-09-27. This allows ALBs to be placed behind an NLB to utilize NLB features such as PrivateLink integration and Static IP. The previous official solution required using a Lambda function to update target IP attachments, which was complex and error prone.

Adding support for the alb target_type would make this use case much easier to set up using Terraform.

New or Affected Resource(s)

• aws_lb_target_group

Potential Terraform Configuration

resource "aws_lb_target_group" "test" {
  name     = "tf-example-lb-tg"
  target_type = "alb"
  ...
}

References

• https://aws.amazon.com/blogs/networking-and-content-delivery/application-load-balancer-type-target-group-for-network-load-balancer/
• https://docs.aws.amazon.com/elasticloadbalancing/latest/network/application-load-balancer-target.html

[ewbankkit]

@robinsummerhill Thanks for raising this issue.
It has already been noticed in #21069. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

This functionality is available in v3.61.0 of the Terraform AWS Provider.

[github-actions]

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