code: public static void childConnectionObserver(ServerBootstrap b,
  			ConnectionObserver connectionObserver) {
  		Objects.requireNonNull(b, "bootstrap");
  		Objects.requireNonNull(connectionObserver, "connectionObserver");
  		b.childOption(OBSERVER_OPTION, connectionObserver);
  	}
docs: Add a childHandler {@link ConnectionObserver} to the passed bootstrap.
  
  @param b the bootstrap to scan
  @param connectionObserver a new {@link ConnectionObserver}