@Override
  public String toString() {
    StringBuffer buffer = new StringBuffer();
    buffer.append("ContainerId=")
        .append(containerId)
        .append("&numberOfBlobs=")
        .append(numberOfBlobs)
        .append("&logicalStorageUsage=")
        .append(logicalStorageUsage)
        .append("&physicalStorageUsage=")
        .append(physicalStorageUsage);
    return buffer.toString();
  }
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