Re: [aodh][ceilometer] how create alarms with prometheus ceilometer backend

19 Sep 2025

      Hello,

I would like to know if aodh supports evaluation-periods and period with
prometheus query type?

  Any help would be appreciated.

Thank you.

Nguyen Huu Khoi

On Fri, Sep 19, 2025 at 7:09 PM Nguyễn Hữu Khôi <nguyenhuukhoinw@gmail.com>
wrote:
...
Hi,
From
https://opendev.org/openstack/python-observabilityclient/src/branch/master/o...
We need  nano /etc/openstack/prometheus.yaml with
host: your-prometheus-host.example.com
port: your prometheus port
on where aodh_evaluator service is running.
Nguyen Huu Khoi
On Thu, Sep 18, 2025 at 9:25 PM Nguyễn Hữu Khôi <nguyenhuukhoinw@gmail.com>
wrote:
...
Hello.
I try to set up alarm such as:
openstack alarm create --type prometheus --type prometheus  --name
memory_high_alarm --query
'memory_usage{resource_id="21d0792e-2d01-4df9-958a-d9018d13207f"}'
--threshold 10
I use ceilometer with prometheus backend but when it shows:
+---------------------------+------------------------------------------------------------------+
| Field                     | Value
                     |
+---------------------------+------------------------------------------------------------------+
| alarm_id                  | cb7b8d07-0af1-4771-92c8-1a4c2ce4d1d1
                      |
| name                      | memory_high_alarm
                     |
| description               | prometheus alarm rule
                     |
| enabled                   | True
                      |
| ok_actions                | []
                      |
| alarm_actions             | []
                      |
| insufficient_data_actions | []
                      |
| repeat_actions            | False
                     |
| type                      | prometheus
                      |
| time_constraints          | []
                      |
| project_id                | 31ef81adc8ad406e9e91e3eb8776c959
                      |
| user_id                   | 2e7a252719434d93ae0d270c8753294d
                      |
| timestamp                 | 2025-09-18T14:10:50.467568
                      |
| state                     | *insufficient data *
                         |
| state_timestamp           | 2025-09-18T14:10:50.467568
                      |
| state_reason              | Not evaluated yet
                     |
| severity                  | low
                     |
| evaluate_timestamp        | 2025-09-18T14:10:50.485384
                      |
| comparison_operator       | eq
                      |
| threshold                 | 10.0
                      |
| query                     |
memory_usage{resource_id="21d0792e-2d01-4df9-958a-d9018d13207f"} |
+---------------------------+------------------------------------------------------------------+
and in aodh logs:
2025-09-18 21:20:02.442 1079 INFO aodh.evaluator [-] initiating
evaluation cycle on 1 alarms
2025-09-18 21:20:02.442 1079 WARNING aodh.evaluator [-] Skipping alarm
cb7b8d07-0af1-4771-92c8-1a4c2ce4d1d1, unsupported type: prometheus
I am using openstack 2025.1
I would like to get some guides on this, Many thanks.
Nguyen Huu Khoi