How can I subscribe an alarm to a notification or SNS topic using CDK?

user_2804256 0
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I know how to create an alarm using AWS CDK but I don't know how to add a notification to that alarm. How do I do that?

This is my code for the alarm:

/**
 * Alarm for CPU above 75%
 */
const metric = cluster.metricCPUUtilization();
new cloudwatch.Alarm(this, `CPU above 75% alarm` , {
  metric: metric,
  threshold: 75,
  evaluationPeriods: 3,
  datapointsToAlarm: 2,
});

This is what it looks like in the console:

Alarm notification in console

amazon-cloudwatch aws-cdk typescript
1 Answers

What you need is an SNS topic and a subscription.

First import the required packages:

import * as sns from "@aws-cdk/aws-sns";
import * as subscriptions from "@aws-cdk/aws-sns-subscriptions";

Then create a topic with an email subscription:

const topic = new sns.Topic(scope, 'Alarm topic', {
  displayName: envSpecificName(props.displayName)
});

topic.addSubscription(
  new subscriptions.EmailSubscription(email)
)

Finally register the topic as an alarm action:

import * as actions from "@aws-cdk/aws-cloudwatch-actions";

...


const metric = cluster.metricCPUUtilization();
const alarm = new cloudwatch.Alarm(this, `CPU above 75% alarm` , {
  metric: metric,
});

alarm.addAlarmAction(new actions.SnsAction(topic));

You can find more examples in documentation

user_1552130
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