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我为 AWS ECS 横向扩展定义了 CloudWatch 警报。

通常它工作正常。但有时它会因以下错误而失败。500 是横向扩展的阈值。公制时间是每 5 分钟一次。并且横向扩展数据点是 2 个中的 1 个（意味着一个值在 10 分钟内超过阈值）：

“错误”：“未找到度量值 [437.08774491907025, 516.9558339660845] 和违反阈值 500.0 的步进调整”

步进调整定义如下：

 step_adjustment {
      metric_interval_lower_bound = 0
      scaling_adjustment          = 1
    }

报警配置：

datapoints_to_alarm         = "1"
  evaluation_periods        = "2"
  threshold                 = "500"

用于创建警报的 Terraform 代码

resource "aws_appautoscaling_policy" "task_count_up" {
  name               = "appScalingPolicy_${aws_ecs_service.sqs_to_kinesis.name}_ScaleUp"
  service_namespace  = "ecs"
  resource_id        = "service/${aws_ecs_cluster.shared-elb-access-logs-processor.name}/${aws_ecs_service.sqs_to_kinesis.name}"
  scalable_dimension = "ecs:service:DesiredCount"

  step_scaling_policy_configuration {
    adjustment_type         = "ChangeInCapacity"
    cooldown                = "${var.scale_up_cooldown_seconds}"
    metric_aggregation_type = "Maximum"

    step_adjustment {
      metric_interval_lower_bound = 0
      scaling_adjustment          = 1
    }

  }

  depends_on = [
    "aws_appautoscaling_target.main",
  ]
}

resource "aws_appautoscaling_policy" "task_count_down" {
  name               = "appScalingPolicy_${aws_ecs_service.sqs_to_kinesis.name}_ScaleDown"
  service_namespace  = "ecs"
  resource_id        = "service/${aws_ecs_cluster.shared-elb-access-logs-processor.name}/${aws_ecs_service.sqs_to_kinesis.name}"
  scalable_dimension = "ecs:service:DesiredCount"

  step_scaling_policy_configuration {
    adjustment_type         = "ChangeInCapacity"
    cooldown                = "${var.scale_down_cooldown_seconds}"
    metric_aggregation_type = "Minimum"

    step_adjustment {
      metric_interval_upper_bound = 0
      scaling_adjustment          = -1
    }

  }

  depends_on = [
    "aws_appautoscaling_target.main",
  ]
}
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