#20895 Plugin upgrade guide does not mention changes in 2.18 or later (e.g. `@rule_helper` removal) Issue created by sureshjoshi https://www.pantsbuild.org/2.19/docs/writing-plugins/common-plugin-tasks/plugin-upgrade-guide Upgraded some of my in-repo plugins and got hit with this. It would be cool if the PR label that something is an API change also reminded to update some of these other docs. I'm casually working on a `migrate` plugin for in-repo plugins, but it won't be ready for some time. pantsbuild/pants