code: def check_arguments(cls, conf):
          
          # Checking the specified list of basic health monitor plugins, which
          # should be run by the multi plugin.
          if not conf.get('multi_plugins'):
              raise ArgsError("A specification of health monitor plugins "
                              "is required (--multi_plugins).")
  
          # Now check parameters for all sub-plugins. We use the list of classes
          # for sub-plugins that we discovered earlier while adding parameters
          # for those sub-plugins.
          for mpc in cls.multi_plugin_classes:
              mpc.check_arguments(conf)
docs: Sanity check plugin options values.