Versions is a feature designed for users of software development practices like Continuous Delivery, particularly those utilizing Rollbar for error monitoring. It enables users to view all new and reactivated errors from each deployed code version across multiple projects from a single screen, aiding in error triage by providing details such as who deployed the version and which errors are resolved or unresolved. This feature supports various deployment patterns, such as canary and blue/green, and helps decide between a full rollout or a rollback. Versions also offers project-level insights and organizes data by Git SHA, although custom version names can be used. Initially incubated in Rollbar's Labs to gather real-world feedback, the feature is now available to Advanced subscription users, emphasizing the importance of detecting errors automatically, rather than relying on user reports.