terraform - aws_cloudwatch_metric_alarm

Question

I am getting a ValidationError: Invalid metrics list when trying to create cloud watch alarms via terraform. Attaching sample terraform changes. Let me know if anyone has insighton this.

resource "aws_cloudwatch_metric_alarm" "quota" {
  alarm_name                = "terraform-service-quota"
  comparison_operator       = "GreaterThanOrEqualToThreshold"
  evaluation_periods        = 1
  threshold                 = 5
  alarm_description         = "Notification for Service quota"
  metric_query {
    id = "currentresourcecount"
    metric {
      metric_name               = "ResourceCount"
      namespace                 = "AWS/Usage"
      period                    = "120"
      stat                 = "Maximum"
      dimensions = {
      Service = var.dimensions["Service"]
      Class = var.dimensions["Class"]
      Type = var.dimensions["Type"]
      Resource = var.dimensions["Resource"]
    }
    }
}
  metric_query {
    id = "percentage of quota used"
    expression = "currentresourcecount/${data.aws_servicequotas_service_quota.pull_by_quota_code.value}*100"
    return_data = "true"
  } 
  actions_enabled = "true"
  depends_on = [aws_sns_topic.cloudwatch-sns]
  alarm_actions = [aws_sns_topic.cloudwatch-sns.arn]
  }

Answer

The issue was with naming convension, seems like i cannot have a space in id name. Had to change the metric_query id name.

Answer

That's correct, the id is [a property of the MetricDataQuery object](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_MetricDataQuery.html) and the valid characters are letters, numbers, and underscore. The first character must be a lowercase letter. You cannot use a space in the id.

Did you try using a Label for the readable display?

terraform - aws_cloudwatch_metric_alarm

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