AWS Cloudwatch Alert Terraform

Question

我目前正在嘗試通過Terraform推出AWS cloudwatch指標警報，但遇到以下錯誤。

Error applying plan:

1 error(s) occurred:

* aws_cloudwatch_metric_alarm.alarm_name: 1 error(s) occurred:

* aws_cloudwatch_metric_alarm.alarm_name: Creating metric alarm failed: ValidationError: Exactly one element of the metrics list should return data.
    status code: 400, request id: xxxxxxxx-xxxxxxx-xxxxxx\n\nTerraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure."

這是Terraform代碼：

resource "aws_cloudwatch_metric_alarm" "elb_monitor" {
  alarm_name                = "openam-elb-monitor"
  comparison_operator       = "GreaterThanOrEqualToThreshold"
  evaluation_periods        = "2"
  threshold                 = "1"
  alarm_description         = "UnHealthyHostCount for openam elbs"
  insufficient_data_actions = []
  metric_query {
      id = "elb_unhealthy_host_count"
      metric {
          metric_name = "UnHealthyHostCount"
          namespace   = "AWS/ELB"
          period      = "120"
          stat        = "Maximum"
          unit        = "Count"
          dimensions  = {
              LoadBalancerName = "development_lb"
          }
      }
    }
}

為什么會這樣？

Answer 1

原來是我的配置。 編寫metric_query嵌套塊的方式，您需要定義要作為警報返回的度量查詢。 因為未配置此選項，所以我收到的exactly one error因為默認情況下指標查詢用於多個查詢。