code: public Deferred<Boolean> allowHistogramPoint(
            final String metric,
            final long timestamp,
            final byte[] value,
            final Map<String, String> tags) {
      throw new UnsupportedOperationException("Not yet implemented.");
    }
docs: Determine whether or not the data point should be stored.
  If the data should not be stored, the implementation can return false or an
  exception in the deferred object. Otherwise it should return true and the
  data point will be written to storage.
  @param metric The metric name for the data point
  @param timestamp The timestamp of the data
  @param value The value encoded as either an integer or floating point value
  @param tags The tags associated with the data point
  @return True if the data should be written, false if it should be rejected.