Although in https://github.com/jenkinsci/external-workspace-manager-plugin/blob/master/doc/WORKSPACE_CLEANUP.md there are measures mentioned to explicitly clean the workspace, I am wondering about the Jenkins built-in measures like https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/hudson/model/WorkspaceCleanupThread.java. Is that cleaning up external workspaces as well?

Does the external-workspace-plugin provide a custom https://github.com/jenkinsci/jenkins/blob/a5238d7d7fb93252951543245fbba4800e4534f8/core/src/main/java/jenkins/slaves/WorkspaceLocator.java#L16 for that purpose.

Or is it rather that I have to take care of that myself?
In any case this should be clarified in the readme.