private void decrementCurrentRequestsIfOneInflight(ChannelHandlerContext ctx) {
        if (ctx.channel().attr(ATTR_REQ_INFLIGHT).getAndSet(null) != null) {
            currentRequestsGauge.set(currentRequests.decrementAndGet());
        }
    }
User: michaels@netflix.com
Date: 4/14/16
Time: 3:51 PM
zuul-core/src/main/java/com/netflix/netty/common/metrics/HttpMetricsChannelHandler.java