Description

The input route53_record_name is described as follows (emphasis mine):

Name of Route53 record to create ACM certificate in and main A-record. If null is specified, var.name is used instead. Provide empty string to point root domain name to ALB.

However the code that actually uses it is as follows:

locals {
  route53_records = {
    A = {
      name    = try(coalesce(var.route53_record_name, var.name), "")
      type    = "A"
      zone_id = var.route53_zone_id
    }
    AAAA = {
      name    = try(coalesce(var.route53_record_name, var.name), "")
      type    = "AAAA"
      zone_id = var.route53_zone_id
    }
  }

Since the coalesce function in Terraform returns the first argument that isn't null or an empty string, setting route53_record_name to empty string will just use name instead...

Reproduction

module "atlantis" {
  source    = "git@github.com:terraform-aws-modules/terraform-aws-atlantis.git?ref=bd43a770af160e627fd2188598e3df60ce4faae3" # v4.4.0
  
  name = "my-atlantis"

  # ...

  route53_record_name = "" # this should cause the record to be created with empty name, but is actually ignored
}

• ✋ I have searched the open/closed issues and my issue is not listed.

Expected behavior

The root domain of the Route54 zone is used.

Actual behavior

The name input is used as subdomain.