void initializeHostUtilizationTracker(final StorageManager storageManager) {
    Gauge<Double> percentageUsedCapacity = storageManager::getHostPercentageUsedCapacity;
    registry.gauge(MetricRegistry.name(StorageManager.class, "HostUsedCapacityPercentage"),
        () -> percentageUsedCapacity);
  }
Initializes gauge that track the percentage used capacity of the host
@param storageManager the {@link StorageManager} instance to use to obtain values.
ambry-store/src/main/java/com/github/ambry/store/StorageManagerMetrics.java