measureBytes(name, size, exclusiveSize, exact) {
    return this._metrics.measureBytes(name, size, exclusiveSize, exact)
  }
Set the size of an operation. If there are no data for the name existing,
the collection will create a set of data before recording the measurement.
If data do exist for the given name, the value will be incremented by the
given size. Use `exclusiveSize` to set the size of this specific operation,
if it is different from the overall size of the operation.

@param {string} name The name of the metric.
@param {number} size The size of the related operation, in megabytes.
@param {number} exclusiveSize The exclusive size of the related operation, in megabytes.
@param {boolean} exact If true, size is interpreted as bytes rather than megabytes
@returns {Stats} The aggregated data related to this metric.