In this blog post, John Burns and Emily Yuan discuss how Netflix leverages ArchUnit and Nebula ArchRules to enhance Java library lifecycle management across their extensive polyrepo strategy. They highlight the challenges faced in maintaining backward compatibility and how annotations can help manage deprecated APIs. The post details the benefits of using ArchUnit for static code analysis via bytecode, contrasting it with traditional AST-based tools, and provides insights into creating reusable and shareable custom rules across repositories. The authors emphasize their ongoing efforts to integrate auto-remediation solutions to streamline technical debt management.