docs: @Deprecated
    public AtomixClusterBuilder setReachabilityThreshold(int threshold) {
      GroupMembershipProtocolConfig protocolConfig = config.getProtocolConfig();
      if (protocolConfig instanceof HeartbeatMembershipProtocolConfig) {
        ((HeartbeatMembershipProtocolConfig) protocolConfig).setPhiFailureThreshold(threshold);
      }
      return this;
    }