private boolean significantGrowthBetween(int start, int end) {
        return queryRateAt(end) >= queryRateAt(start) * (1 + SIGNIFICANT_GROWTH_FACTOR);
    }
The max query growth rate we can predict from this time-series as a fraction of the average traffic in the window

This considers query over all known snapshots, but snapshots are effectively bounded in time by the retention
period of the metrics database.

@return the predicted max growth of the query rate, per minute as a fraction of the current load
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/ClusterTimeseries.java