The document summarizes the process of rebuilding Puppet infrastructure at Adform, including moving from a monolithic setup to a more modular one using roles, profiles, and Hiera for data storage. Key changes included adopting version control and testing for Puppet code, implementing a CI/CD pipeline, and using tools like Vagrant and Puppet Explorer for local development and monitoring production nodes. The rebuilt infrastructure followed Puppet best practices for code organization, reuse, and separation of configuration data from logic.