public String toString() {
            return "cpu model idealLoad: " + idealLoad() + ", queryFraction: " + queryFraction() +
                   ", growthRateHeadroom: " + growthRateHeadroom(at) + ", trafficShiftHeadroom: " + trafficShiftHeadroom(at);
        }
The estimated fraction of cpu usage which goes to processing queries vs. writes
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/ClusterModel.java