code: public final void record(final String name,
                             final Number value,
                             final String xtratag) {
      record(name, value.longValue(), xtratag);
    }
docs: Records a data point.
  @param name The name of the metric.
  @param value The current value for that metric.
  @param xtratag An extra tag ({@code name=value}) to add to those
  data points (ignored if {@code null}).
  @throws IllegalArgumentException if {@code xtratag != null} and it
  doesn't follow the {@code name=value} format.