@Override
    public String toString() {
        return "LatencyMetrics{" +
                "averageLatency=" + latency +
                ", maxLatency=" + maxLatency +
                ", maxActiveLatency=" + maxActiveLatency +
                ", numIntervalsStarted=" + startHz +
                ", numIntervalsEnded=" + endHz +
                ", load=" + load +
                ", maxLoad=" + maxLoad +
                ", currentLoad=" + currentLoad +
                '}';
    }
Returns the number of active intervals right now.
zkfacade/src/main/java/com/yahoo/vespa/curator/stats/LatencyMetrics.java