无数据时CloudWatch告警处于告警状态

Question

我有一个基于DynamoDB指标WriteThrottleEvents的CloudWatch警报。9月份有一个节流数据点，导致警报进入警报状态，但是从那时起就没有其他节流数据点，但警报仍然处于警报状态。警报之前将“处理丢失的数据”设置为ignore (这最初解释了为什么它停留在警报状态)，但是我现在将其更改为missing，但是警报仍然处于警报状态，尽管没有数据点。为什么没有将状态更改为‘数据不足’？

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{
  "MetricAlarms": [
    {
      "AlarmName": "WriteThrottleEvents_Alarm",
      "AlarmArn": "******************",
      "AlarmConfigurationUpdatedTimestamp": "2021-02-25T20:07:44.960000+00:00",
      "ActionsEnabled": true,
      "OKActions": [],
      "AlarmActions": ["******************"],
      "InsufficientDataActions": [],
      "StateValue": "ALARM",
      "StateReason": "Threshold Crossed: 1 out of the last 1 datapoints [1.0 (22/09/20 18:21:00)] was greater than or equal to the threshold (1.0) (minimum 1 datapoint for OK -> ALARM transition).",
      "StateReasonData": "{\"version\":\"1.0\",\"queryDate\":\"2020-09-22T18:22:44.912+0000\",\"startDate\":\"2020-09-22T18:21:00.000+0000\",\"unit\":\"Count\",\"statistic\":\"Average\",\"period\":60,\"recentDatapoints\":[1.0],\"threshold\":1.0}",
      "StateUpdatedTimestamp": "2020-09-22T18:22:44.915000+00:00",
      "MetricName": "WriteThrottleEvents",
      "Namespace": "AWS/DynamoDB",
      "Statistic": "Average",
      "Dimensions": [
        {
          "Name": "TableName",
          "Value": "table-one"
        }
      ],
      "Period": 60,
      "Unit": "Count",
      "EvaluationPeriods": 1,
      "DatapointsToAlarm": 1,
      "Threshold": 1.0,
      "ComparisonOperator": "GreaterThanOrEqualToThreshold",
      "TreatMissingData": "missing"
    }
  ],
  "CompositeAlarms": []
}

Answer 1

您可以将missing data设置为notBreaching。这样，缺少数据点将被视为好的：

丢失的数据点被视为“良好”，并且在阈值内，