globalTierMetrics.Observe(tier, since)
			globalTierMetrics.logSuccess(tier)
		} else {
			op.Error = err.Error()
			globalTierMetrics.logFailure(tier)
		}

		logger.GetReqInfo(ctx).AppendTags("tierStats", op)
	}
}

// getTransitionedObjectReader returns a reader from the transitioned tier.

	size, err := sio.EncryptedSize(uint64(o.Size))
	if err != nil {
		// This cannot happen since AWS S3 allows parts to be 5GB at most
		// sio max. size is 256 TB
		reqInfo := (&logger.ReqInfo{}).AppendTags("size", strconv.FormatUint(size, 10))
		ctx := logger.SetReqInfo(GlobalContext, reqInfo)
		logger.CriticalIf(ctx, err)
	}
	return int64(size)
}

		resp.Results[i] = convPartErrToInt(err)

		// Only log unknown errors
		if resp.Results[i] == checkPartUnknown && err != errFileAccessDenied {
			logger.GetReqInfo(ctx).AppendTags("disk", s.String())
			storageLogOnceIf(ctx, err, partPath)
		}
	}

	return &resp, nil
}

// ReadMultiple will read multiple files and send each back as response.