'Returns the datapoints for a metric.
The show_watch_metric method returns the datapoints associated
with a specified metric, or all metrics if no metric_name is passed.
:param ctxt: RPC context.
:param metric_namespace: Name of the namespace you want to see,
or None to see all
:param metric_name: Name of the metric you want to see,
or None to see all'

def show_watch_metric(self, ctxt, metric_namespace=None, metric_name=None):

    return self.call(ctxt, self.make_msg('show_watch_metric', metric_namespace=metric_namespace, metric_name=metric_name))
