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Spec Bug "AWS::CloudWatch::Alarm" "MetricName" (required) ?

See original GitHub issue

According to the Documentation and the Spec files the AWS::CloudWatch::Alarm MetricName is not required: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cw-alarm.html#cfn-cloudwatch-alarms-metricname

But deploying an Allarm without MetricName results in an error:

Used resource:

  CloudWatchAlarm:
    Type: "AWS::CloudWatch::Alarm"
    Properties:
      ComparisonOperator: "GreaterThanOrEqualToThreshold"
      EvaluationPeriods: 1
      Statistic: "SampleCount"
      Threshold: 0.0
      TreatMissingData: "notBreaching"
      Unit: "Terabits/Second"

Issue Analytics

State:
Created 5 years ago
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

cmmeyercommented, Feb 1, 2019

Ok, clarification on an internal list.

You can define a Metrics complex parameter -or- any of:

MetricName
Dimensions
Period
Namespace
Statistic
ExtendedStatistic

So, each of those properties has an OnlyOne relationship with Metrics. Additionally, ExtendedStatistic and Statistic are OnlyOne with one or the other required… unless you’ve supplied Metrics in which case you can’t use either. Oh, this is a fun one!

0reactions

kddejongcommented, Mar 30, 2019

I think we can close this one. I just submitted pull request https://github.com/aws-cloudformation/cfn-python-lint/pull/771 to clean some of this up. From my testing Metrics or MetricName had to be specified. The list that @chuckmeyer has for attributes that can’t be defined when Metrics are defined also looks accurate.

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