How do I configure an AWS Network Load Balancer to preserve client IP addresses using Terraform?

Question

The AWS console allows an NLB target group to be configured to preserve client IP addresses:

However, this setting doesn't appear to be available in Terraform's load balancer target group: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group

How can I enable this option through Terraform, or is it not supported?

Preserve client IP addresses is an option within the Attributes section of a load balancer target group. Other options there are Proxy protocol v2, Stickiness, Connection termination on deregistration and Deregistration delay. The Terraform LB target group includes proxy_protocol_v2, stickiness and deregistration_delay, but not the other two options (as far as I can see).

Answer 1

As of v3.35.0 of the AWS provider, it is now possible.

Answer 2

Looks like it's not possible to configure via Terraform at the moment, but at least it doesn't get overwritten if you set it manually.