Terraform创建AWS CloudWatch指标过滤器与告警未关联问题咨询

云上老周

2026-9-28

问题根因

配置的指标名称不匹配导致关联失败，不存在额外的关联配置步骤：

aws_cloudwatch_log_metric_filter资源的metric_transformation块中定义的输出指标名称为duplicate-titlregsubmit-metric-${var.environment}
aws_cloudwatch_metric_alarm资源中填写的metric_name为duplicate-titlregsubmit-filter-metric-${var.environment}，多了-filter字符，和指标过滤器输出的指标名称不一致，导致告警实际关联的是不存在的指标，自然无法和你创建的指标过滤器绑定。

修正方案

将告警资源中的metric_name值修改为和指标过滤器metric_transformation.name完全一致即可，修正后代码如下：

#cloudwatch metric filter
resource "aws_cloudwatch_log_metric_filter" "titleregsubmit-metric-filter" {
  name           = "duplicate-titlregsubmit-filter-metric-${var.environment}"
  pattern        = "Submit transaction exists for VIN"
  log_group_name = var.loggroupname

  metric_transformation {
    name      = "duplicate-titlregsubmit-metric-${var.environment}"
    namespace = "MN DMV Errors 2"
    value     = "1"
  }
}

#cloud watch metric alarm
resource "aws_cloudwatch_metric_alarm" "duplicate-titleregsubmit-alarm" {
  alarm_name          = "mn-duplicate-titleregsubmit-${var.environment}"
  metric_name         = "duplicate-titlregsubmit-metric-${var.environment}"
  threshold           = "0"
  statistic           = "Sum"
  comparison_operator = "GreaterThanThreshold"
  datapoints_to_alarm = "1"
  evaluation_periods  = "1"
  period              = "300"
  namespace           = "MN DMV Errors 2"
  alarm_actions       = [aws_sns_topic.nomads-alerts-sns.arn]
}