To successfully operate CloudWatch integration with AWS Mainframe Modernization EC2 instances deployed via our AWS Marketplace listing, it is imperative to configure AWS Identity and Access Management (IAM) role and policy. This specifically tailored IAM setup is not optional; it authorizes your Amazon EC2 instances to interact with the AWS CloudWatch Service. The IAM role and policy allow the AWS Mainframe Modernization service to accurately record and publish metrics to CloudWatch, which is essential for monitoring and auditing. For more information, see CloudWatch metrics and logging services integration.