terraform资源需要根据变量创建多个CloudWatch告警，该告警在计划中得到确认，但只部署一个告警

variable "alarms" {
  type    = list(object({
    name          = string
    comparison_operator = string
    threshold     = number
    evaluation_periods = number
    alarm_actions = list(string)
  }))
  default = [
    {
      name          = "CPUUtilization"
      comparison_operator = "GreaterThanOrEqualToThreshold"
      threshold     = 90
      evaluation_periods = 3
      alarm_actions = ["arn:aws:sns:us-west-2:123456789012:my-topic"]
    },
    {
      name          = "DiskUsage"
      comparison_operator = "GreaterThanOrEqualToThreshold"
      threshold     = 80
      evaluation_periods = 3
      alarm_actions = ["arn:aws:sns:us-west-2:123456789012:my-topic"]
    }
  ]
}

resource "aws_cloudwatch_metric_alarm" "example" {
  count                = length(var.alarms)
  alarm_name           = var.alarms[count.index].name
  comparison_operator  = var.alarms[count.index].comparison_operator
  evaluation_periods   = var.alarms[count.index].evaluation_periods
  threshold            = var.alarms[count.index].threshold
  alarm_description    = "This metric monitors ${var.alarms[count.index].name}"
  alarm_actions        = var.alarms[count.index].alarm_actions

  metric_query {
    expression = "AVG(${var.alarms[count.index].name}) >= ${var.alarms[count.index].threshold}"
  }
}