def fetch_metric_descriptor(self, metric_type): """Look up a metric descriptor by type. Example:: >>> METRIC = 'compute.googleapis.com/instance/cpu/utilization' >>> print(client.fetch_metric_descriptor(METRIC)) :type metric_type: string :param metric_type: The metric type name. :rtype: :class:`~gcloud.monitoring.metric.MetricDescriptor` :returns: The metric descriptor instance. :raises: :class:`gcloud.exceptions.NotFound` if the metric descriptor is not found. """ return MetricDescriptor._fetch(self, metric_type)