[Bug 1946793] Re: aodh uses deprecated gnocchi api to aggregate metrics and doesn't work properly
James Page
1946793 at bugs.launchpad.net
Mon Mar 14 08:58:32 UTC 2022
** Changed in: aodh
Status: In Progress => Fix Released
** Changed in: aodh (Ubuntu)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1946793
Title:
aodh uses deprecated gnocchi api to aggregate metrics and doesn't work
properly
Status in Aodh:
Fix Released
Status in aodh package in Ubuntu:
In Progress
Bug description:
On gnocchi API docs, there are 2 API methods to aggregate metrics
1. /v1/aggregation/metric?
See: https://gnocchi.osci.io/rest.html#aggregation-across-metrics-
deprecated
This one is deprecated
2. /v1/aggregates?
See: https://gnocchi.osci.io/rest.html#dynamic-aggregates
aodh uses the 1st one to aggregate metrics, for example:
```
if isinstance(start, datetime.datetime):
start = start.isoformat()
if isinstance(stop, datetime.datetime):
stop = stop.isoformat()
params = dict(start=start, stop=stop, aggregation=aggregation,
reaggregation=reaggregation, granularity=granularity,
needed_overlap=needed_overlap, groupby=groupby,
refresh=refresh, resample=resample, fill=fill)
if query is None:
for metric in metrics:
self._ensure_metric_is_uuid(metric)
params['metric'] = metrics
measures = self._get("v1/aggregation/metric",
params=params).json()
```
aodh doesn't work properly in our production environment after
upgraded to Ussuri.
When there is only 1 instance, aodh works properly and alarms can be
triggered when the load on the instance is higher than the threshold.
However, after the stack is scaled up, and the second instance is
created. The average cpu usage got from gnocchi by aodh evaluator is
not correct. The metric measures are negative sometimes.
I manually pulled metrics with gnocchi command
The aggregation of metrics is correct with command
```
openstack metric aggregates
```
It uses new API in the backend
The aggregation of metrics is not correct with command
```
openstack metric measures aggregation
```
It uses the deprecated API which aodh is using.
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