kubernetes - 異なる名前空間を持つ HPA

Question

次のkubernetesセットアップがあります

sn.  type          service  namespace
1.   statefulset   rabbitmq rabbitmq
2.   deployment    pods     default
3.   hpa           hpa      default

メトリックは、次のように `/apis/custom.metrics.k8s.io/v1beta1 にエクスポートされます

{
  "kind": "APIResourceList",
  "apiVersion": "v1",
  "groupVersion": "custom.metrics.k8s.io/v1beta1",
  "resources": [
    {
      "name": "services/rabbitmq_queue_messages_ready",
      "singularName": "",
      "namespaced": true,
      "kind": "MetricValueList",
      "verbs": [
        "get"
      ]
    },
    {
      "name": "namespaces/rabbitmq_queue_messages_ready",
      "singularName": "",
      "namespaced": false,
      "kind": "MetricValueList",
      "verbs": [
        "get"
      ]
    },
    {
      "name": "pods/rabbitmq_queue_messages_ready",
      "singularName": "",
      "namespaced": true,
      "kind": "MetricValueList",
      "verbs": [
        "get"
      ]
    }
  ]
}

hpaの構成

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: demo-hpa
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: test-pod2
  minReplicas: 1
  maxReplicas: 2
  metrics:
  - type: Object
    object:
      metric:
        name: "rabbitmq_queue_messages_ready"
      describedObject:
        apiVersion: custom.metrics.k8s.io/v1/beta1
        kind: Service
        name: rabbitmq
      target:
        type: Value
        value: 50

default名前空間にhpa をデプロイしようとすると、次のエラーが発生します。

 ScalingActive  False   FailedGetObjectMetric  the HPA was unable to compute the replica count: unable to get metric rabbitmq_queue_messages_ready: Service on default rabbitmq/unable to fetch metrics from custom metrics API: the server could not find the metric rabbitmq_queue_messages_ready for services rabbitmq

ただし、同じ hpa が設定されている場合は、hpa で名前空間rabbitmqを実行します

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: demo-hpa
  namespace: rabbitmq
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: test-pod2
  minReplicas: 1
  maxReplicas: 2
  metrics:
  - type: Object
    object:
      metric:
        name: "rabbitmq_queue_messages_ready"
      describedObject:
        apiVersion: custom.metrics.k8s.io/v1/beta1
        kind: Service
        name: rabbitmq
      target:
        type: Value
        value: 50

および deployment.yaml として

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-pod2
  labels:
    app: test-pod2
  namespace: rabbimtq
spec:
  replicas: 1
  selector:
    matchLabels:
      app: test-pod2
  template:
    metadata:
      labels:
        app: test-pod2
    spec:
      containers:
        - name: test-pod2
          image: golang:1.16
          command: ["sh", "-c", "tail -f /etc/hosts"]

展開は完璧に機能します。

サービス rabbitmq のメトリクスをrabbitmq名前空間から他の名前空間にエクスポートして、スケーリングに使用できる方法はありますか???