public void add(long n, Point p) {
        metricReceiver.update(new Sample(new Measurement(n), new Identifier(name, p), AssumedType.COUNTER));
    }
Add to this metric at the given point.

@param n
           the amount by which to increase this counter
@param p
           the point in the metric space at which to add to the metric
container-core/src/main/java/com/yahoo/metrics/simple/Counter.java