Some plugins may be replaced by others or just become irrelevant (e.g. integration with a service which was shut down). We do not recommend deleting source code outright, even a stale or no-longer-relevant code can still be educational. However, we do have a mechanism for deprecating or hiding plugins in the Jenkins update centers. This page describes the process.
Set a deprecated label for the plugin. It can be done in 2 ways:
Put a deprecated topic in the plugin’s GitHub repository.
If you have multiple plugins inside a single repository, it will apply to all of them
Add a deprecated label to the plugin entry in the Update Center’s label-definitions.properties file
Update the plugin’s documentation to explain the reason of the deprecation
Release the plugin and put the deprecation notice into the changelog
Deprecate the plugin as documented above
Submit a pull request to the Update Center’s artifact-ignores.properties file
Archive the plugin’s repository
If you have admin permissions in the repository, it is possible to do it from the GitHub’s web interface
Otherwise, create a help desk ticket to archive the plugin’s repository
If required, it is possible to revert all the actions above. A Jenkins Jira ticket is required to unarchive a plugin, but the rest can be done via pull requests to the respective update center files mentioned above.