public Builder physicalStorageUsage(long physicalStorageUsage) {
      this.physicalStorageUsage = physicalStorageUsage;
      return this;
    }
Set physical storage usage for {@link Builder}.
@param physicalStorageUsage The physical storage usage.
@return Current Builder.
ambry-api/src/main/java/com/github/ambry/server/storagestats/ContainerStorageStats.java