Increments counter by given value.

        :param name: a counter name of Increment type.

        :param value: a value to add to the counter.

def increment(self, name, value):
        """
        Increments counter by given value.

        :param name: a counter name of Increment type.

        :param value: a value to add to the counter.
        """
        for counter in self._counters:
            counter.increment(name, value)