Api Versioning Deprecation Planner

This handles the messy human side of API deprecation that most teams wing until they break something. You get concrete timelines (6 month templates with monthly checklists), communication templates for warning users, and clear guidelines on what counts as a breaking change versus safe evolution. The migration guide structure is solid, walking through authentication, response format, and pagination changes with before-and-after code. It covers the three main versioning approaches (URL, header, query param) with actual tradeoffs, plus monitoring snippets to track who's still hitting your old endpoints. The rollback section is honest about what to do when migrations go sideways. Good for teams shipping v2 of an API that real customers depend on.