SAR-Propagate-CloudFormation-Tags

SAR app to propagate CloudFormation's stack tags to resources that are currently not propagated automatically - e.g. CloudWatch Logs.

Deploying to your account (via the console)

Go to this page and click the Deploy button.

This app would deploy the following resources to your region:

• a Propagate Lambda function that propagates CloudFormation's tags to resources that aren't tagged automatically
• a CloudWatch event pattern that triggers the Propagate function whenever CloudFormation:CreateStack and CloudFormation:UpdateStack events are captured by CloudTrail
• a PropagateAll Lambda function that iterates through all CloudFormation stacks in the region and propates their tags, this function is only triggered once, when you deploy the SAR app
• a Custom::LambdaInvocation CloudFormation custom resource, which would trigger the PropagateAll Lambda function during the deployment of this SAR app

Deploying via SAM/Serverless framework/CloudFormation

To deploy this app via SAM, you need something like this in the CloudFormation template:

AutoDeployMyAwesomeLambdaLayer:
  Type: AWS::Serverless::Application
  Properties:
    Location:
      ApplicationId: arn:aws:serverlessrepo:us-east-1:374852340823:applications/propagate-cfn-tags
      SemanticVersion: <enter latest version>

To do the same via CloudFormation or the Serverless framework, you need to first add the following Transform:

Transform: AWS::Serverless-2016-10-31

For more details, read this post.