It would be great if the DSL and the linked javadoc/groovydoc had @since or equivalent tags corresponding to when properties and methods were added. It could even be applied to plugins, and maybe there could be some @incubating-since notation, so you can get a quick feel as to how long something has been incubating.
This information can be dug up by looking through the old release notes and trolling through the documentation to see when something appeared (or even digging into the github source to find out revision numbers there), but it’s much more cumbersome to do this.
-Spencer