aws-cdk-lib/aws-cloudwatch: Tags don't attach to CloudWatch alarms

[dacampos1]

Describe the bug

I am trying to add tags to my Cloudwatch Alarm. I am using the Alarm construct from aws-cdk-lib/aws-cloudwatch. The parent stack has a set of default tags that all other resources inherit, except for Cloudwatch Alarms. I have also tried adding tags to this resource manually, but it does not work.

Expected Behavior

Tags can be added to the resource and verified on the AWS console.

Current Behavior

The tags don't attach to the resource.

Reproduction Steps

import * as cdk from 'aws-cdk-lib';
import * as sns from 'aws-cdk-lib/aws-sns';
import * as cloudwatch from 'aws-cdk-lib/aws-cloudwatch';
import { Construct } from 'constructs';

export class MyStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);
    const topic = new sns.Topic(this, 'Topic', {
      displayName: 'My SNS topic',
    });
    const _alarm = new cloudwatch.Alarm(this, 'Alarm', {
      metric: topic.metricNumberOfMessagesPublished(),
      threshold: 10,
      evaluationPeriods: 1,
      alarmName: 'My SNS alarm',
      alarmDescription: 'Triggered when message count exceeds 10',
      comparisonOperator:
        cloudwatch.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
    });
  }
}

and then

import * as cdk from 'aws-cdk-lib';

const env = {
  account: process.env.AWS_ACCOUNT_ID,
  region: process.env.AWS_REGION,
};
const app = new cdk.App();
new MyStack(app, 'stack', {
  env,
  tags: {
    testTag: 'testValue',
  },
});
cdk.Tags.of(app).add('testTag', 'testValue');

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.76.0

Framework Version

No response

Node.js Version

v16.18.1

OS

13.2.1

Language

Typescript

Language Version

4.8.4

Other information

No response

[khushail]

Hi @dacampos1 , as of now Cloudformation does not support adding tags to cloudwatch alarms. This request has been worked upon by the team here.

[github-actions]

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[rgoltz]

@dacampos1 - If you have stack-level Tags, you should see Tags are getting propagate to AWS::CloudWatch::Alarm - Please check my test-case and comment here: aws-cloudformation/cloudformation-coverage-roadmap#64 (comment)

[tommyhegarty]

After the rollout of the tags for CloudWatch Alarms in CloudFormation, this is still bugged in CDK. Stack-level tags are not currently propagating down to Alarms when the template is generated with cdk synth.