Remove the given labelset from the metric.

def remove(self, *labelvalues):
        if not self._labelnames:
            raise ValueError('No label names were set when constructing %s' % self)

        """Remove the given labelset from the metric."""
        if len(labelvalues) != len(self._labelnames):
            raise ValueError('Incorrect label count (expected %d, got %s)' % (len(self._labelnames), labelvalues))
        labelvalues = tuple(unicode(l) for l in labelvalues)
        with self._lock:
            del self._metrics[labelvalues]