@Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (int) this.bound;
        result = prime * result + (this.upper ? 1 : 0);
        return result;
    }
An upper or lower bound for metrics
clients/src/main/java/org/apache/kafka/common/metrics/Quota.java