new_contents: from pecan import response, expose
  from ceph_installer.hooks import system_checks, SystemCheckError
  
  
  class StatusController(object):
  
      @expose('json')
      def index(self):
          for check in system_checks:
              try:
                  check()
              except SystemCheckError as system_error:
                  response.status = 500
                  return {'message': system_error.message}
          return dict(message="ok")
  
subject: create a status controller for system health