如何获取k8s和prometheus-adapter中外部指标的值

Question

我在 AWS (EKS) 上有一个 k8s。我使用

prometheus-adapter

来公开 HPA (HorizontalPodAutoscaler) 的

custom metrics

和

external metrics

。我正在使用 Helm 安装

prometheus-adapter

（图表版本 4.9.0）。

我正在尝试获取外部指标的值，但未能成功。

我可以看到指标就在那里：

kubectl get --raw '/apis/external.metrics.k8s.io/v1beta1' | jq .

输出：

{
  "kind": "APIResourceList",
  "apiVersion": "v1",
  "groupVersion": "external.metrics.k8s.io/v1beta1",
  "resources": [
    {
      "name": "some_dummy_sqs_01",
      "singularName": "",
      "namespaced": true,
      "kind": "ExternalMetricValueList",
      "verbs": [
        "get"
      ]
    }
  ]
}

我尝试过以下路径，但没有成功：

1. /apis/external.metrics.k8s.io/v1beta1/some_dummy_sqs_01

   ->

   Error from server (NotFound): the server could not find the requested resource

2. /apis/external.metrics.k8s.io/v1beta1/namespaces/some_dummy_sqs_01

   ->

   Error from server (NotFound): the server could not find the requested resource

3. /apis/external.metrics.k8s.io/v1beta1/namespaces//some_dummy_sqs_01

   ->

   Error from server (InternalError): Internal error occurred: unable to fetch metrics

4. /apis/external.metrics.k8s.io/v1beta1/namespaces/*/some_dummy_sqs_01

   ->

   Error from server (InternalError): Internal error occurred: unable to fetch metrics

5. /apis/external.metrics.k8s.io/v1beta1/namespaces/prometheus/some_dummy_sqs_01

   ->

   Error from server (InternalError): Internal error occurred: unable to fetch metrics

prometheus-adapter

配置如下所示：

# prom-adapter-values.yaml

prometheus:
  url: http://prometheus-server
  port: 80

rules:
  default: false
  external:
    - seriesQuery: 'sqs_approximatenumberofmessages{queue!="",namespace!=""}'
      resources:
        namespaced: false
      name:
        matches: ""
        as: "some_dummy_sqs_01"
      metricsQuery: 'sum(rate(<<.Series>>[1m]) by (queue)'

Answer 1

你尝试过吗

kubectl get --raw /apis/external.metrics.k8s.io/v1beta1/namespaces/default/some_dummy_sqs_01