[aws-cloudwatch] Missing ThresholdMetricId

When creating Cloudwatch Alarm that makes use of anomaly detection the following error is raised at deploy time:

ComparisonOperators for ranges require ThresholdMetricId to be set (Service: AmazonCloudWatch; Status Code: 400; Error Code: ValidationError; Request ID: xxx; Proxy: null)

Reproduction Steps

aws_cloudwatch.Alarm(
     self,
    "my_alarm",
    evaluation_periods=1,
    metric=sqs_queue.metric_number_of_messages_sent(),
    threshold=2,
    statistic="Average",
    comparison_operator=aws_cloudwatch.ComparisonOperator.LESS_THAN_LOWER_OR_GREATER_THAN_UPPER_THRESHOLD,
)

The Alarm construct works great for any of the other ComparisonOperators that do not rely on anomaly detection i.e. GreaterThanThreshold.

Environment

CLI Version : 1.62.0
Framework Version: 1.64.0
Node.js Version: v12.14.1
OS : MacOS Catalina
Language (Version): Python 3.7

This is 🐛 Bug Report

Issue Analytics

State:
Created 3 years ago
Reactions:4
Comments:10 (5 by maintainers)

Top GitHub Comments

6reactions

NetaNircommented, Nov 11, 2020

In the meantime, If you really need this feature you can configure it using escape hatch:

const anomalyDetectionExp = new cloudwatch.MathExpression({
  expression: 'ANOMALY_DETECTION_BAND(m1,2)',
  usingMetrics: {
    m1: metricA,
  },
  label: 'Anomaly detection',
  period: cdk.Duration.minutes(1),
});

const alarm = anomalyDetectionExp.createAlarm(this, 'MyAlarm', {
  evaluationPeriods: 1, 
  threshold: 5, // dummy value will be removed below 
  comparisonOperator: ComparisonOperator.LESS_THAN_LOWER_OR_GREATER_THAN_UPPER_THRESHOLD,
});

const cfnAlarm = alarm.node.defaultChild as CfnAlarm;
cfnAlarm.addPropertyDeletionOverride('Threshold');
(alarm.node.defaultChild as CfnAlarm).thresholdMetricId = 'expr_1'; // The id will always be 'expr_1' if there is one expression

5reactions

olavencommented, Dec 1, 2021

👋 A status update on this would be highly appreciated!

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