Not able to find how to get the cpu and memory metrics per pod

[efotopoulou]

What is the feature and why do you need it:
Current version of kubernetes client seems not to promote the access at current monitoring metrics from the ApiClient(). For example:

from kubernetes import client

api_client = client.ApiClient()
ret_metrics = api_client.call_api(
            '/apis/metrics.k8s.io/v1beta1/namespaces/' + 'default' + '/pods', 'GET',
            auth_settings=['BearerToken'], response_type='json', _preload_content=False)
response = ret_metrics[0].data.decode('utf-8')
print('RESP', json.loads(response))

Instead has introduced a set of Classes making possible the interaction with k8s cluster.
I can not find how to get the current cpu,memory (or any other custom metric) values via the proposed APIs .

I see it exists the model V2beta2PodsMetricStatus which indicates the current value of a metric describing each pod in the current scale target, but i can not find with Class to use so as to acces it.

Describe the solution you'd like to see:
I would like to be able to acces the current values of all metrics of a pod or all pods.
A usage example would be really helpfull.

Thank you very much for your time and effort!

[roycaihw]

/assign @yliaog

[yliaog]

https://kubernetes.io/docs/tasks/debug-application-cluster/resource-metrics-pipeline/

provides information about how to setup metrics pipeline to collect metrics. do you have it setup properly in you cluster? could you use kubectl to get the metrics?

[yliaog]

also please try using the dynamic python client, https://github.com/kubernetes-client/python-base/tree/master/dynamic

[efotopoulou]

Thank you yliaog for your response. i can fetch the metrics using kubectl without problem. The question was if i can get them via the kubernetes-client APIs.
I am not sure which API i should use so as to fetch the V2beta2PodsMetricStatus model.

Just for helping any other developer, this is how i fetch the metrics from kubectl via my python app:

p = subprocess.getoutput('kubectl get --raw /apis/metrics.k8s.io/v1beta1/namespaces/default/pods')
ret_metrics = json.loads(p)
items = ret_metrics['items']

Not sure how to use the dynamic client you propose. The link you send me misses documentation.

[shivakumargn]

Any updates on this? The official client does not seem to have implementation for any apis and models for the /apis/metrics.k8s.io objects.

[yliaog]

could you please check out the dynamic client test code: https://github.com/kubernetes-client/python-base/blob/master/dynamic/test_client.py?

it has some examples with custom resources.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

Send feedback to sig-contributor-experience at kubernetes/community.
/lifecycle rotten

[fejta-bot]

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

Send feedback to sig-contributor-experience at kubernetes/community.
/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

Send feedback to sig-contributor-experience at kubernetes/community.
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[kposborne]

From this stack overflow question, here is an example of using the custom objects api to get the metrics:
https://stackoverflow.com/questions/63295451/i-need-to-get-resource-usage-of-pods-in-a-kubernetes-cluster-with-kubernetes-pyt

>>> from kubernetes import client, config
>>> 
>>> config.load_kube_config()
>>> api = client.CustomObjectsApi()
>>> resource = api.list_namespaced_custom_object(group="metrics.k8s.io",version="v1beta1", namespace="default", plural="pods")
>>> for pod in resource["items"]:
...    print(pod['containers'], "\n")
...