docs: def verify_deprecated_policy(old_policy, new_policy, default_rule, context):
      """Check the rule of the deprecated policy action
  
      If the current rule of the deprecated policy action is set to a non-default
      value, then a warning message is logged stating that the new policy
      action should be used to dictate permissions as the old policy action is
      being deprecated.
  
      :param old_policy: policy action that is being deprecated
      :param new_policy: policy action that is replacing old_policy
      :param default_rule: the old_policy action default rule value
      :param context: the monasca context
      """
  
      if _ENFORCER:
          current_rule = str(_ENFORCER.rules[old_policy])
      else:
          current_rule = None
  
      if current_rule != default_rule:
          LOG.warning("Start using the new action '{0}'. The existing "
                      "action '{1}' is being deprecated and will be "
                      "removed in future release.".format(new_policy,
                                                          old_policy))
          target = {'project_id': context.project_id,
                    'user_id': context.user_id}
  
          return authorize(context=context, action=old_policy, target=target)
      else:
          return False