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Description

I have a use case where I need to retrieve the currently-installed versions of the AKS-managed Istio service mesh.

The data is present in the API (version 2023-10-01):

{
    // <snip>
    "type": "Microsoft.ContainerService/ManagedClusters",
    "properties": {
        // <snip>
        "serviceMeshProfile": {
            "mode": "Istio",
            "istio": {
                "components": {
                    "ingressGateways": [
                        {
                            "mode": "Internal",
                            "enabled": true
                        }
                    ]
                },
                "revisions": [  // ######## this is what I need
                    "asm-1-19"
                ]
            }
        }
    },
}

However, that data does not appear in the data source for azurerm_kubernetes_cluster in state file:

  "resources": [
    {
      "mode": "data",
      "type": "azurerm_kubernetes_cluster",
      "name": "aks",
      "provider": "provider[\"registry.terraform.io/hashicorp/azurerm\"]",
      "instances": [
        {
            # <snip>
            "service_mesh_profile": [
              {
                "external_ingress_gateway_enabled": false,
                "internal_ingress_gateway_enabled": true,
                "mode": "Istio"
                # This is where I wish the "revisions" block was present
              }
            ],
            # <snip>
          },
          "sensitive_attributes": []
        }
      ]
    }
  ],

In goal state, I'd like to be able to calculate the newest revision installed (might need to be its own property, unless anyone knows the way to get the max() function to accept strings), so I can use that to label kubernetes_namespace_v1 objects based on the latest revision.

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

azurerm_kubernetes_cluster

Potential Terraform Configuration

data "azurerm_kubernetes_cluster" "aks" {
  resource_group_name = var.kubernetes_cluster_resource_group_name
  name                = var.kubernetes_cluster_name
}

resource "kubernetes_namespace_v1" "ns" {
  metadata {
    name = local.kubernetes_namespace_name
    labels = {
      "istio.io.rev" = data.azurerm_kubernetes_cluster.aks.service_mesh_profile.istio.latest_revision # "asm-1-19"
    }
  }
}

References

relates to #24386?