+ aggregation = METRIC_AGGREGATORS.get(openstack_metric_name)
+
+ try:
+ measures = self.client.metric.get_measures(openstack_metric_name,
+ aggregation=aggregation,
+ start=time.time() - 1200,
+ resource_id=resource_id)
+ if measures:
+ value = measures[-1][2]
+ except gnocchiclient.exceptions.NotFound as e:
+ # CPU metric in previous Openstack versions do not support rate:mean aggregation method
+ if openstack_metric_name == "cpu":
+ log.debug("No metric %s found for instance %s: %s", openstack_metric_name, resource_id, e)
+ log.debug("Retrying to get metric %s for instance %s without aggregation",
+ openstack_metric_name, resource_id)
+ measures = self.client.metric.get_measures(openstack_metric_name,
+ resource_id=resource_id,
+ limit=1)
+ else:
+ raise e
+ # measures[-1] is the last measure
+ # measures[-2] is the previous measure
+ # measures[x][2] is the value of the metric
+ if measures and len(measures) >= 2:
+ value = measures[-1][2] - measures[-2][2]
+ if value:
+ # measures[-1][0] is the time of the reporting interval
+ # measures[-1][1] is the duration of the reporting interval
+ if aggregation:
+ # If this is an aggregate, we need to divide the total over the reported time period.
+ # Even if the aggregation method is not supported by Openstack, the code will execute it
+ # because aggregation is specified in METRIC_AGGREGATORS
+ value = value / measures[-1][1]
+ if openstack_metric_name in METRIC_MULTIPLIERS:
+ value = value * METRIC_MULTIPLIERS[openstack_metric_name]