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Discover how to utilize AWS SDK to retrieve resource tags related to AWS CloudWatch Events for better notification management.
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How to Get Resource Tags for AWS CloudWatch Events Using Lambda

In the world of cloud computing, managing resources effectively is crucial for maintaining a smooth workflow. One of the powerful tools provided by AWS (Amazon Web Services) is CloudWatch Events. They allow you to trigger actions based on specific conditions, such as compliance breaches in AWS Config, which can be incredibly useful. However, what happens when you need additional information, like the tags associated with those resources, for more tailored notifications?

This guide will guide you through a common problem developers face: How can you retrieve resource tags when an AWS CloudWatch event is triggered?

Understanding the Problem

With your existing setup:

You have an AWS CloudWatch Event configured to trigger whenever a resource is found to be non-compliant with a particular rule in AWS Config.

This event invokes a Lambda function that sends notifications to a general channel alerting the relevant parties.

However, it's possible you want these notifications to be more targeted, based on the AWS tags assigned to each resource. For instance, different teams might manage different resources, and tagging them accordingly helps in routing notifications to the appropriate channels.

The Limitation

Unfortunately, the payload sent to your Lambda function by CloudWatch Events does not contain specific information about the tags associated with the triggered resource. This creates a challenge when trying to send more relevant notifications based on ownership and team assignments.

The Solution: Using AWS SDK

To get around this limitation, you can modify your Lambda function to include the logic to retrieve the necessary tags. Here’s how you can do it:

Step 1: Set Up the AWS SDK

You will need to utilize the AWS SDK (Software Development Kit) within your Lambda function to programmatically access the tags associated with the resource in question.

Install AWS SDK: Make sure your Lambda environment supports AWS SDK. It's pre-installed in AWS Lambda, so you can use it directly.

Step 2: Identify the Resource

The Lambda function will receive an event payload when it is triggered by CloudWatch Events. In this payload, you'll find the resource ID or ARN (Amazon Resource Name).

Make sure you extract this information early in your function.

Step 3: Retrieve Tags

Using the AWS SDK, implement a function to retrieve the tags for the resource. For example, if your resource is an EC2 instance, you can do the following:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Forward Notifications

After retrieving the tags, you can decide how to route your notifications. There are a couple of options here:

Forward to Different Consumers: You could send the notifications to multiple destinations based on the tags.

Use SQS or EventBridge: Consider setting up an SQS queue or creating a custom EventBridge rule for different teams to consume specific messages.

Step 5: Update Your Notification Logic

Lastly, make sure your notification logic adapts based on the retrieved tags. This may include sending a message to different Slack channels, email addresses, or other communication tools used by your organization.

Conclusion

While AWS CloudWatch Events do not natively provide tags with their event notifications, the flexibility afforded by the AWS SDK allows you to programmatically retrieve this crucial information. By implementing this solution, you'll enable more targeted notifications and ultimately improve the incident response within your organization.

Now you can ensure that team-specific notifications reach the appropriate channels, leading to quicker resolutions and effective team collaboration.

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