docs: @RequirePOST
      public void doCancelRestart(StaplerResponse response) throws IOException, ServletException {
          synchronized (jobs) {
              for (UpdateCenterJob job : jobs) {
                  if (job instanceof RestartJenkinsJob) {
                      if (((RestartJenkinsJob) job).cancel()) {
                          LOGGER.info("Scheduled Jenkins reboot unscheduled");
                      }
                  }
              }
          }
          response.sendRedirect2(".");
      }