code: @Deprecated
    public final NettyChannelBuilder enableKeepAlive(boolean enable, long keepAliveTime,
        TimeUnit delayUnit, long keepAliveTimeout, TimeUnit timeoutUnit) {
      if (enable) {
        return keepAliveTime(keepAliveTime, delayUnit)
            .keepAliveTimeout(keepAliveTimeout, timeoutUnit);
      }
      return keepAliveTime(KEEPALIVE_TIME_NANOS_DISABLED, TimeUnit.NANOSECONDS);
    }
docs: Enable keepalive with custom delay and timeout.
  
  @deprecated Please use {@link #keepAliveTime} and {@link #keepAliveTimeout} instead