如何使用KEDA度量-api触发器？

Question

在这里也提出了这个问题，但没有得到任何回应：https://github.com/kedacore/keda/issues/3669

尝试使用此触发器：https://keda.sh/docs/2.8/scalers/metrics-api/

我对如何使用它很灵活--这是我的第一次尝试：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-keda-charlie
  namespace: tsew
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx-keda-charlie
  template:
    metadata:
      labels:
        app: nginx-keda-charlie
    spec:
      containers:
      - name: nginx-keda-charlie
        image: nginx
        imagePullPolicy: Always
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: http-scaledobject
  namespace: tsew
  labels:
    deploymentName: nginx-keda-charlie
spec:
  scaleTargetRef:
    name:        nginx-keda-charlie
  triggers:
    - type: metrics-api
      metadata:
        metricType: Value
        targetValue: "1"
        url: "http://mockbin.org/bin/9cb318e0-e8d8-4dc5-a18f-f6135a0e2d4a"
        valueLocation: 'tasks'

但我知道这个错误：

"HorizontalPodAutoscaler.autoscaling "keda-hpa-http-scaledobject“无效: spec.metrics.external.target.averageValue:无效值:d:resource.infDecAmount scale:0}，d:resource.infDecAmount{Dec:(*inf.Dec)(nil)}，s:"0"，格式：”DecimalSI“}：必须为正”

sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.12.3/pkg/internal/controller/controller.go:121 sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.12.3/pkg/internal/controller/controller.go:320 Sigs.k8s.io/控制器-runtime/pkg/internal/controller.(*Controller).processNextWorkItem /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.12.3/pkg/internal/controller/controller.go:273 sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2 /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.12.3/pkg/internal/controller/controller.go:234 2022-09-14T19:59:54Z错误协调器错误{“控制器”：“缩放对象”，"controllerGroup"："keda.sh"，"controllerKind"："ScaledObject"，"scaledObject"：{ "name"："http-scaledobject"，“命名空间”：“tsew”}，“命名空间”："tsew"，“name”："http-scaledobject"，"reconcileID"："a7d1c215-a585-4a65-b85d-ba1152746edf"，"HorizontalPodAutoscaler.autoscaling“：”HorizontalPodAutoscaler.autoscaling "keda-hpa-http-scaledobject“无效: spec.metrics.external.target.averageValue:无效值:spec.metrics.external.target.averageValue:0}，d:resource.infDecAmount{Dec:(*inf.Dec)(nil)}，s:"0"，格式：“DecimalSI”}：必须是肯定的“}DecimalSI

重现问题的步骤

在OSX上安装minikube v1.26.1安装KEDA，类似于此https://github.com/kedacore/keda/releases/download/v2.8.0/keda-2.8.0.yaml

• kubectl应用程序deployment.yaml

Answer 1

您的度量API触发器应该返回application/json以使其工作。示例中的端点返回Content-Type: text/html; charset=utf-8。试试这个mockbin：https://mockbin.org/bin/336a8d99-9e09-4f1f-979d-851a6d1b1423