code: public List<Milestone> getGroupMilestones(Object groupIdOrPath) throws GitLabApiException {
          return (getGroupMilestones(groupIdOrPath, getDefaultPerPage()).all());
      }
docs: Get a list of group milestones.
  
  @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
  @return the milestones associated with the specified group
  @throws GitLabApiException if any exception occurs