Use ItemListener.onDeleted from a plugin. I suppose you are asking for some sort of “userspace” hook, like a shell script or something, which you could configure perhaps as a JobProperty. If so, this would better be moved to plugin-proposals.

Seems like a straight-up duplicate of JENKINS-37907, which seems to have been closed improperly.

I assume that would require writing a separate Jenkins plugin for that (like here)? Or, could I use it in Jenkinsfile? And yes, I was asking if there is any posibility to achieve that (i.e. via script) beside coding a dedicated plugin.

could I use it in Jenkinsfile?

No, because this is outside a build context.

Is something changed in the context of this ticket with 2.x plugins available?

Not that I am aware of.

Ideally, you would want to be able to run a special section in your Jenkinsfile that gets executed just before a job and its workspace gets deleted (only when it actually has one). Even though at that point the git-branch is already deleted and a fetch for the latest version would be impossible, it would allow cleanup scripts that still reside in the workspace from its last execution to be executed.

jgeluk ah but where would you log that execution? How would you find out that it failed?

I think this could be more easily handled by an extension plugin.

You have the listener, a multibranch project property could add an action that shows the tidy-up logs and you could have some pipeline step that defines the tidy-up steps of a branch in the pipeline. Then the listener looks at the branch, sees that it has the tidy-up steps action, grabs them and allows the delete to continue...meanwhile it schedules an execution of the tidy-up that is attached to the multibranch project rather than the job.

Now the above is not trivial... but it is all straighforward (i.e. I do not envision any major pitfalls along the way) and I think it would fit into the overall design for how all these things work quite well