autoscaling_attributes state drift

[akobir-mp]

when specifying multiple autoscaling_attributes, terraform always show drift on plans/applies - it appears that only one attribute is retained.

Terraform Version

Terraform v1.2.3

Affected Resource(s)

• spotinst_elastigroup_aws

In particular integration_ecs.autoscale_attributes

Terraform Configuration Files

################################################################################
## Configuration
################################################################################

terraform {
  required_version = "1.2.3"

  required_providers {
    spotinst = {
      source  = "spotinst/spotinst"
      version = "1.81.0"
    }
  }
}

################################################################################
## Providers
################################################################################

provider "spotinst" {
  token   = var.spotinst_token
  account = var.spotinst_account
}

################################################################################
## Resources
################################################################################

resource "spotinst_elastigroup_aws" "this" {
  capacity_unit                                      = "instance"
  description                                        = "test"
  desired_capacity                                   = 0
  draining_timeout                                   = 120
  ebs_optimized                                      = false
  enable_monitoring                                  = false
  fallback_to_ondemand                               = true
  health_check_grace_period                          = 300
  health_check_type                                  = "ECS_CLUSTER_INSTANCE"
  health_check_unhealthy_duration_before_replacement = 120
  iam_instance_profile                               = "ecsInstanceRole"
  image_id                                           = "ami-089b46fd88a494dea"
  instance_types_ondemand                            = "c4.2xlarge"
  instance_types_preferred_spot = [
    "t3.medium",
    "t3a.medium",
  ]
  instance_types_spot = [
    "m5.large",
    "t3.medium",
    "t3a.medium",
  ]
  key_name              = "default"
  lifetime_period       = "days"
  max_size              = 350
  min_size              = 0
  name                  = "test"
  orientation           = "balanced"
  persist_block_devices = false
  persist_private_ip    = false
  persist_root_device   = false
  placement_tenancy     = "default"
  product               = "Linux/UNIX"
  region                = "us-east-2"
  security_groups = [
    "sg-0e8c1ee2de9067b05",
  ]
  spot_percentage = 100
  subnet_ids = [
    "subnet-0358e8f5db8b59006",
    "subnet-0e82701dff333fc05",
    "subnet-0d06c156506660460",
  ]
  user_data                  = "test"
  utilize_commitments        = false
  utilize_reserved_instances = false

  integration_ecs {
    autoscale_cooldown                     = 300
    autoscale_is_auto_config               = true
    autoscale_is_enabled                   = true
    autoscale_scale_down_non_service_tasks = false
    cluster_name                           = "st1"

    autoscale_attributes {
      key   = "attribute1"
      value = "true"
    }
    autoscale_attributes {
      key   = "attribute2"
      value = "true"
    }
    autoscale_attributes {
      key   = "attribute3"
      value = "true"
    }
    autoscale_attributes {
      key   = "attribute4"
      value = "true"
    }
  }

  network_interface {
    associate_public_ip_address = true
    delete_on_termination       = true
    description                 = "default interface"
    device_index                = "0"
  }

  resource_tag_specification {
    should_tag_amis      = false
    should_tag_enis      = false
    should_tag_snapshots = false
    should_tag_volumes   = false
  }

  revert_to_spot {
    perform_at = "always"
  }

  tags {
    key   = "Name"
    value = "test"
  }
}

Debug Output

https://gist.github.com/akobir-mp/07e3e000c1b1f07324c80c4435327d7f

Expected Behavior

The autoscale_attributes should not show changes.

Actual Behavior

autoscale_attributes shows changes despite the fact that no changes were made. Only a single attribute is retained.

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # spotinst_elastigroup_aws.this will be updated in-place
  ~ resource "spotinst_elastigroup_aws" "this" {
        id                                                 = "sig-7247c397"
        name                                               = "test"
        # (36 unchanged attributes hidden)

      ~ integration_ecs {
            # (5 unchanged attributes hidden)

          + autoscale_attributes {
              + key   = "attribute2"
              + value = "true"
            }
          + autoscale_attributes {
              + key   = "attribute3"
              + value = "true"
            }
          + autoscale_attributes {
              + key   = "attribute4"
              + value = "true"
            }
            # (1 unchanged block hidden)
        }

        # (4 unchanged blocks hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Steps to Reproduce

1. create a spotinst_elastigroup_aws resource with multiple autoscale_attributes within integration_ecs
2. terraform apply
3. terraform plan with no modifications will show changes

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