docs: def add_policy(self, scaling_group, name, policy_type, cooldown,
              change=None, is_percent=False, desired_capacity=None, args=None):
          """
          Adds a policy with the given values to the specified scaling group. The
          'change' parameter is treated as an absolute amount, unless
          'is_percent' is True, in which case it is treated as a percentage.
          """
          return self._manager.add_policy(scaling_group, name, policy_type,
                  cooldown, change=change, is_percent=is_percent,
                  desired_capacity=desired_capacity, args=args)