def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def get_schema(self):
        """Returns the set YAML schema for the metric class.

        Returns:
          YAML schema of the metrics type.
        """
        return self._schema