(autoscaling): StepScalingPolicy add evaluationPeriods parameter

[BDeus]

When creating a StepScalingPolicy for an ASG, we cannot configured the evaluationPeriods of the CloudwatchAlarm created in underlying. The default value is enforced to 1

Proposed Solution

Add a property in BasicStepScalingPolicyProps:

/**
  * The number of the most recent periods, or data points, to evaluate when determining alarm state.
  * @default Default evaluation periods for cloudwatch alarms
  */
  readonly alarmEvaluationPeriods?: number;
}
...
this.upperAlarm = new cloudwatch.Alarm(this, 'UpperAlarm', {
    // Recommended by AutoScaling
    metric: props.metric,
    alarmDescription: 'Upper threshold scaling alarm',
    comparisonOperator: cloudwatch.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
    evaluationPeriods: props.alarmEvaluationPeriods,
    threshold,
});

Links

https://github.com/aws/aws-cdk/blob/404b5569bb76e3f579dd3005dcf06eeeae9df7f6/packages/%40aws-cdk/aws-autoscaling/lib/step-scaling-policy.ts#L109

https://github.com/aws/aws-cdk/blob/404b5569bb76e3f579dd3005dcf06eeeae9df7f6/packages/%40aws-cdk/aws-autoscaling/lib/step-scaling-policy.ts#L144

• [ ] :wave: I may be able to implement this feature request
• [ ] :warning: This feature might incur a breaking change

---

This is a :rocket: Feature Request

[rix0rrr]

Closed by #13366

[github-actions[bot]]

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