+ async def get_metrics(self, *tags):
+ """Retrieve metrics.
+
+ :param str \*tags: Tags of entities from which to retrieve metrics.
+ No tags retrieves the metrics of all units in the model.
+ """
+ log.debug("Retrieving metrics for %s",
+ ', '.join(tags) if tags else "all units")
+
+ metrics_facade = client.MetricsDebugFacade()
+ metrics_facade.connect(self.connection)
+
+ entities = [client.Entity(tag) for tag in tags]
+ metrics_result = await metrics_facade.GetMetrics(entities)
+
+ metrics = collections.defaultdict(list)
+
+ for entity_metrics in metrics_result.results:
+ error = entity_metrics.error
+ if error:
+ if "is not a valid tag" in error:
+ raise ValueError(error.message)
+ else:
+ raise Exception(error.message)
+
+ for metric in entity_metrics.metrics:
+ metrics[metric.unit].append(vars(metric))
+
+ return metrics
+