Deprecated projects
The Deprecated projects plugin for WordPress allows you to easily add a notice to pages on your site which need to include a “deprecated” notice. Simply install, activate and then toggle the notice on or off via the checkbox which will appear in a metabox when editing a post or page.
This plugin was created for here on geek.hellyer.kiwi, but I’ve uploaded it here in case it is of use to some of you. The notice is hard coded into it, so you may wish to fork the plugin, or if you require it, I can add some filters to let you edit the notice content via another plugin or theme.