code: @RequirePOST
      public synchronized HttpResponse doConfigSubmit( StaplerRequest req) throws IOException, ServletException, FormException {
          BulkChange bc = new BulkChange(MONITORS_OWNER);
          try {
              Jenkins.getInstance().checkPermission(Jenkins.ADMINISTER);
              monitors.rebuild(req,req.getSubmittedForm(),getNodeMonitorDescriptors());
  
              // add in the rest of instances are ignored instances
              for (Descriptor<NodeMonitor> d : NodeMonitor.all())
                  if(monitors.get(d)==null) {
                      NodeMonitor i = createDefaultInstance(d, true);
                      if(i!=null)
                          monitors.add(i);
                  }
  
              // recompute the data
              for (NodeMonitor nm : monitors) {
                  nm.triggerUpdate();
              }
  
              return FormApply.success(".");
          } finally {
              bc.commit();
          }
      }
docs: Accepts submission from the configuration page.