aws_cloudwatch: Alarm dimensions support

[guidojw]

Describe the feature

It is currently not possible to add dimensions to the Alarm construct while it is possible to do so using CfnAlarm. Support for dimensions on the Alarm construct itself would be nice so we don't have to do some lower level magic with the Cfn construct.

Use Case

I have logic that depends on a specific dimension to exist on an alarm.
With alarms based on for example MetricFilters metrics, the metric's dimensions do not propagate to the alarm so I need to set them manually on the alarm. While it is possible with CfnAlarm, this makes it inconvenient because all other alarms are of the Alarm construct and have convenience methods like addAlarmAction, where both the fields are slightly different on CfnAlarm and it does not have these methods.

Proposed Solution

const alarm = new cloudwatch.Alarm(this, 'Errors', {
  comparisonOperator: cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
  threshold: 1,
  evaluationPeriods: 1,
  metric: alias.metricErrors(),
  dimensions: { Type: 'type' }
});

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

latest

Environment details (OS name and version, etc.)

N/A

[pahud]

We probably can add that in AlarmProps or CreateAlarmOptions.

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[guidojw]

We probably can add that in AlarmProps or CreateAlarmOptions.

I think it should be CreateAlarmOptions in order for it to work with Metric.createAlarm and in the Alarm constructor.
Then for my application with a MetricFilter-based alarm it is possible to:

new MetricFilter(self, 'MetricFilter', {}).metric({}).createAlarm(self, 'MetricFilterMetricAlarm', {
	dimensions: { key: 'value' }
})