April 2026 monthly summary for rubygems/rubygems and Shopify/ruby. Delivered a plugin hook infrastructure for gem and git source fetch operations, enabling flexible network control, improved observability, and plugin-driven customization. Implemented cross-repo changes with four new hook points around actual network IO (before-fetch/after-fetch and before-git-fetch/after-git-fetch), moved gem fetch hooks to download_gem to fire only on real network I/O, and aligned hook semantics with existing before-*/after-* patterns. Removed outdated hooks and arguments (e.g., GEM_BEFORE_FETCH/GEM_AFTER_FETCH from Source::Git#install and the source argument for hooks) to reduce noise and improve consistency. This work lowers noise from cache hits, improves testability, and enables future network policy enforcement and caching optimizations. Co-authored contributions across repositories with shared design and commit alignment across rubygems/rubygems and Shopify/ruby.