cloudwatch_log_group_name output returning incorrect value

[paul-pop]

I have issues

I'm submitting a...

• bug report
• feature request
• support request - read the FAQ first!
• kudos, thank you, warm fuzzy

What is the current behavior?

The cloudwatch_log_group_name output from the cluster is currently returned as a tuple.

If this is a bug, how to reproduce? Please include a code sample if relevant.

1. Create a new cluster and set cluster_enabled_log_types = ["api"] so the CloudWatch group gets created.
2. Wait for the cluster to be created and check the cloudwatch_log_group_name output is in the state
3. Use the cloudwatch_log_group_name output in a different resource, like below:

resource "aws_cloudwatch_log_subscription_filter" "eks_cluster_logs_to_datadog" {
  name            = "${local.eks_cluster_name}-subscription"
  log_group_name  = module.eks_cluster.cloudwatch_log_group_name
  filter_pattern  = ""
  destination_arn = "lambda_arn_goes_here"
}

4. Observe the error:

Error: Incorrect attribute value type

  on eks.tf line 151, in resource "aws_cloudwatch_log_subscription_filter" "eks_cluster_logs_to_lambda":
 151:   log_group_name  = module.eks.cloudwatch_log_group_name
    |----------------
    | module.eeks.cloudwatch_log_group_name is tuple with 1 element

Inappropriate value for attribute "log_group_name": string required.

What's the expected behavior?

The cloudwatch_log_group_name output should be a simple string so it can be reused correctly.

Are you able to fix this problem and submit a PR? Link here if you have already.

#1061

Environment details

• Affected module version: 12.2.0
• OS: macOS Catalina
• Terraform version: v0.13.4

Any other relevant info

Temporary fix is to use module.eks_cluster.cloudwatch_log_group_name[0] instead but that's inconsistent with every other output.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.