@Monitor(name = "OverallResponseTimeMillisStdDev", type = DataSourceType.INFORMATIONAL,
             description = "Standard Deviation in total time to handle a request, in milliseconds")
    public double getResponseTimeStdDev() {
        return responseTimeDist.getStdDev();
    }
Gets the standard deviation in the total amount of time spent handling a request, in milliseconds.
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/ServerStats.java