Terraform not saving state of ECS Cluster containerInsights setting

Question

This is my template:

resource "aws_ecs_cluster" "doesntmatter" {
  name = var.doesntmatter_name

  capacity_providers = ["FARGATE", "FARGATE_SPOT"]
  setting {
    name  = "containerInsights"
    value = "enabled"
  }

  tags = var.tags
}

When I run it. It properly creates cluster and sets containerInsights to enabled.

But when I run terrafrom again. It wants to change this property as if it wasn't set before. It doesn't matter how many times I run it. It still thinks it needs to change it every deployment.

Additionally, the terraform state show resName does show that this setting is saved in state file.

Answer 1

It's a bug that is resolved with v3.57.0 of the Terraform AWS Provider (released yesterday).

Amazon ECS is making a change to the ECS Describe-Clusters API. Previously, the response to a successful ECS Describe-Clusters API request included the cluster settings by default. This behavior was incorrect since, as documented here (https://docs.aws.amazon.com/cli/latest/reference/ecs/describe-clusters.html), cluster settings is an optional field that s hould only be included when explicitly requested by the customer. With the change, ECS will no longer surface the cluster settings field in response to the Describe-Clusters API by default. Customers can continue to use the --include SETTINGS flag with the Describe-Clusters API to receive the cluster settings.

Tracking bug: https://github.com/hashicorp/terraform-provider-aws/issues/20684