code: public Evaluator removeGroupSubscriptions(String group) {
      List<Subscription> oldSubs = subscriptions.remove(group);
      if (oldSubs != null) {
        LOGGER.debug("removed group {} with {} subscriptions", group, oldSubs.size());
      }
      return this;
    }
docs: Remove subscriptions for a given group.
  
  @param group
  Name of the group. At Netflix this is typically the cluster that includes
  the instance reporting data.
  @return
  This instance for chaining of update operations.