code: @RequirePOST
      public void doConfigSubmit( StaplerRequest req, StaplerResponse rsp ) throws IOException, ServletException, FormException {
          final Jenkins app = Jenkins.getInstance();
  
          app.checkPermission(Jenkins.ADMINISTER);
  
          properties.rebuild(req, req.getSubmittedForm(), getApplicablePropertyDescriptors());
  
          this.description = req.getSubmittedForm().getString("description");
  
          updateTransientActions();
          save();
  
          FormApply.success(".").generateResponse(req, rsp, null);
      }
docs: Accepts the update to the node configuration.