cloudwatch-action: support alarm action lambda

[neilkuan]

Describe the feature

Cloudwatch alarm action support Lambda now.
Let's add new alarm action for lambda
https://aws.amazon.com/tw/about-aws/whats-new/2023/12/amazon-cloudwatch-alarms-lambda-change-action/

cfn-cloudwatch-alarm-alarmactions

API_PutMetricAlarm

Use Case

For cloudwatch alarm action support Lambda now.

Proposed Solution

Now I already used this way to setting AlarmAction to Lambda Function.

const alarm = new cdk.aws_cloudwatch.Alarm(this, 'Errors', {
      comparisonOperator: cdk.aws_cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
      threshold: 1,
      evaluationPeriods: 1,
      metric: alias.metricErrors({period: cdk.Duration.minutes(1)}),
      actionsEnabled: true,
      treatMissingData: cdk.aws_cloudwatch.TreatMissingData.NOT_BREACHING
    });
    const sns = new cdk.aws_sns.Topic(this, 'Topic', {
      displayName: 'alarmTopic',
    });
    alarmLambda.addPermission('addCloudWatch', {
      principal: new cdk.aws_iam.ServicePrincipal('lambda.alarms.cloudwatch.amazonaws.com'),
      sourceAccount: this.account,
      sourceArn: alarm.alarmArn,
      action: 'lambda:InvokeFunction',
    });
    alarm.addAlarmAction(new cdk.aws_cloudwatch_actions.SnsAction(sns));
    this.node.tryRemoveChild(sns.node.id);
    (alarm.node.defaultChild as cdk.aws_cloudwatch.CfnAlarm).addPropertyOverride(
      'AlarmActions',  [alarmLambda.functionArn]
    )

I will Create another class like LambdaAction(alarmLambda) to support it !

Other Information

No response

Acknowledgements

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

CDK version used

2.116.0

Environment details (OS name and version, etc.)

macOS 14.2.1

[pahud]

This is awesome! Thank you @neilkuan

[rslowinski]

hey @neilkuan, sorry for off-topic but where did you find this "lambda.alarms.cloudwatch.amazonaws.com"? on aws docs i've only seen "events.amazonaws.com" and it wasn't working for my case where i needed cloudwatch alarm to trigger a lambda, it started working with "lambda.alarms.cloudwatch.amazonaws.com" which i found by accident here 😅

[neilkuan]

hey @neilkuan, sorry for off-topic but where did you find this "lambda.alarms.cloudwatch.amazonaws.com"? on aws docs i've only seen "events.amazonaws.com" and it wasn't working for my case where i needed cloudwatch alarm to trigger a lambda, it started working with "lambda.alarms.cloudwatch.amazonaws.com" which i found by accident here 😅

Here. 😎

https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html#alarms-and-actions

[github-actions]

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