@Override
  public void snapshot(MetricsRecordBuilder builder, boolean all) {
    if (all || changed()) {
      builder.addCounter(info(), value());
      clearChanged();
    }
  }
Increment the value by a delta
@param delta of the increment
hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableFastCounter.java