Deprecation warning about `workload_identity_config. identity_namespace`

[lra]

When planning and applying, we get the following warning:

╷
│ Warning: Deprecated Attribute
│ 
│   with module.stack.module.gke.module.gke.google_container_cluster.primary,
│   on .terraform/modules/stack.gke.gke/modules/private-cluster/cluster.tf line 22, in resource "google_container_cluster" "primary":
│   22: resource "google_container_cluster" "primary" {
│ 
│ This field will be removed in a future major release as it has been deprecated in the API. Use `workload_pool` instead.
│ 
│ (and 4 more similar warnings elsewhere)
╵

I think this is about the following block in the google_container_cluster.primary resource in modules/private-cluster/cluster.tf:

  dynamic "workload_identity_config" {
    for_each = local.cluster_workload_identity_config

    content {
      identity_namespace = workload_identity_config.value.identity_namespace
    }
  }

Per the doc, this should use workload_pool instead.

Versions used:

module "gke" {
  source  = "terraform-google-modules/kubernetes-engine/google//modules/private-cluster"
  version = "~> 17.1.0"

Terraform v1.0.10
on darwin_amd64
+ provider registry.terraform.io/hashicorp/aws v3.63.0
+ provider registry.terraform.io/hashicorp/azurerm v2.83.0
+ provider registry.terraform.io/hashicorp/external v2.1.0
+ provider registry.terraform.io/hashicorp/google v3.90.1
+ provider registry.terraform.io/hashicorp/google-beta v3.90.1
+ provider registry.terraform.io/hashicorp/kubernetes v2.6.1
+ provider registry.terraform.io/hashicorp/null v3.1.0
+ provider registry.terraform.io/hashicorp/random v3.1.0

[bharathkkb]

Thanks for the report. Happy to review a PR fixing this

https://github.com/hashicorp/terraform-provider-google/blob/5e7d3e8c52fa3bf6b0e4c4344cb7f205dd8dda1e/website/docs/guides/version_4_upgrade.html.markdown#workload_identity_config0identity_namespace-is-now-removed

[lra]

Thanks for pointing to that doc, you got it: #1052