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我有一个启用了详细监控的自动缩放组。我应该能够创建一个自动缩放策略，允许我根据 p95 CPUUtilization 进行缩放，就像我在 Cloudwatch 中的图表中看到的那样。但是，我找不到真正的例子来说明它的样子。

我有几个失败的例子：

resource aws_autoscaling_policy asg_scaling {
  name                      = "${local.component}-scaling-policy"
  adjustment_type           = "ChangeInCapacity"
  policy_type               = "TargetTrackingScaling"
  autoscaling_group_name    = "${aws_autoscaling_group.asg.name}"
  estimated_instance_warmup = 300

  target_tracking_configuration {
    predefined_metric_specification {
      predefined_metric_type = "p95.CPUUtilization"
    }

    target_value = 40.0
  }
}

失败了

* aws_autoscaling_policy.asg_scaling: Error putting scaling policy: ValidationError: 1 validation error detected: Value 'p95.CPUUtilization' at 'targetTrackingConfiguration.predefinedMetricSpecification.predefinedMetricType' failed to satisfy constraint: Member must satisfy enum value set: [ASGAverageCPUUtilization, ASGAverageNetworkOut, ASGAverageNetworkIn, ALBRequestCountPerTarget]
    status code: 400, request id: 83ecfae0-94fe-11e8-8c0a-112a070bfa5d

另一个尝试看起来像

resource aws_autoscaling_policy asg_scaling {
  name                      = "${local.component}-scaling-policy"
  adjustment_type           = "ChangeInCapacity"
  policy_type               = "TargetTrackingScaling"
  autoscaling_group_name    = "${aws_autoscaling_group.asg.name}"
  estimated_instance_warmup = 300

  target_tracking_configuration {
    customized_metric_specification {
      metric_dimension {
        name  = "AutoScalingGroupName"
        value = "${aws_autoscaling_group.asg.name}"
      }

      metric_name = "CPUUtilization"
      namespace   = "EC2"
      statistic   = "p95"
    }

    target_value = 40.0
  }
}

失败了

* aws_autoscaling_policy.asg_scaling: Error putting scaling policy: ValidationError: 1 validation error detected: Value 'p95' at 'targetTrackingConfiguration.customizedMetricSpecification.statistic' failed to satisfy constraint: Member must satisfy enum value set: [Maximum, SampleCount, Sum, Minimum, Average]
    status code: 400, request id: e05440ac-94fb-11e8-abba-43f2e6549e03

有谁知道如何将 p95 与“TargetTrackingScaling”策略一起使用？

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