@Override
  public int hashCode() {
    return Objects.hash(containerId, logicalStorageUsage, physicalStorageUsage, numberOfBlobs);
  }
True if all the storage stats values are 0.
@return True if all the stats values are 0.
ambry-api/src/main/java/com/github/ambry/server/storagestats/ContainerStorageStats.java