public Record combine(Record o) {
    return ofEntries(values.keySet().stream().map(k -> {
      if (k.getFieldValueType() == FieldValueType.STRING) {
        return entry(k, values.get(k));
      }
      return entry(k, values.get(k).plus(o.values.get(k)));
    }));
  }
Represents a record of the metrics in the top screen.
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/Record.java