public final void awaitTermination() throws InterruptedException {
        for (Channel chan : addressesToChannels.values()) {
            chan.closeFuture().sync();
        }
    }
Use {@link #Server(Registry, ServerStatusManager, Map, ClientConnectionsShutdown, EventLoopGroupMetrics,
EventLoopConfig)}
instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/Server.java