2

我正在尝试使用 Prometheus 自定义指标和Prometheus Adapter自动扩展 Kubernetes 部署和 HPA 。这些自定义指标通过另一个命名空间中的另一个部署发布到 Prometheus，每分钟查询一个 REST API 以获取特定指标，然后将该指标的值发布到 Prometheus。从那里，适配器应该能够向 Prometheus 查询所述指标，并使用一些附加标签作为查询条件，并使用新名称发布该指标。从那里，HPA 应该能够获取此指标并根据其值进行缩放。

这里是我的部署的标签，适配器应该基于它的匹配：

Labels:             app.kubernetes.io/instance=event-subscription-dev-dev
                    app.kubernetes.io/managed-by=Tiller-dev
                    app.kubernetes.io/name=event-subscription-dev
                    deployment-name=event-subscription-webhook-worker-dev
                    helm.sh/chart=event-subscription-0.1.0-dev

以下是 Prometheus Adapter Helm 图表值/适配器规则：

logLevel: 1
metricsRelistInterval: 5s
prometheus:
  url: 'http://<prometheus-url>'
rules:
  custom:
    - seriesQuery: '{__name__="event_subscription_current_message_lag"}'
      name: 
        matches: "(.*)"
        as: '${1}_webhooks'
      resources: 
        overrides:
          namespace: {resource: "namespace"}
          pod: {resource: "pod"}
      metricsQuery: 'sum(event_subscription_current_message_lag{queue="webhooks", container_name!="POD"})'
    - seriesQuery: '{__name__="event_subscription_current_message_lag"}'
      name: 
        matches: "(.*)"
        as: '${1}_webhook_retries'
      resources: 
        overrides:
          namespace: {resource: "namespace"}
          pod: {resource: "pod"}
      metricsQuery: 'sum(event_subscription_current_message_lag{queue="webhook_retries", container_name!="POD"})'

这是metrics我的 HPA 规范的一部分：

 metrics:
  - type: Pods
    pods:
      metric:
        name: event_subscription_current_message_lag_webhooks
      target:
        type: AverageValue
        averageValue: 10
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 85

我在这里遇到的问题不是适配器查询指标然后发布新指标，而是新指标没有与原始指标相关联的值。

例如，如果我运行，kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1我确实看到了我的event_subscription_current_message_lag_webhooks和event_subscription_current_message_lag_webhook_retries指标，但它们不像原始event_subscription_current_message_lag指标那样具有任何价值。

这是来自的输出kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta1/namespaces/event-subscription/pods/*/event_subscription_current_message_lag"

{
  "kind": "MetricValueList",
  "apiVersion": "custom.metrics.k8s.io/v1beta1",
  "metadata": {
    "selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/event-subscription/pods/%2A/event_subscription_current_message_lag"
  },
  "items": [
    {
      "describedObject": {
        "kind": "Pod",
        "namespace": "event-subscription",
        "name": "activemq-message-lag-retrieval-7bfc46b948-jr8kp",
        "apiVersion": "/v1"
      },
      "metricName": "event_subscription_current_message_lag",
      "timestamp": "2019-11-08T22:09:53Z",
      "value": "1"
    }
  ]
}

event_subscription_current_message_lag_webhooks这是and的输出event_subscription_current_message_lag_webhook_retries：

{
  "kind": "MetricValueList",
  "apiVersion": "custom.metrics.k8s.io/v1beta1",
  "metadata": {
    "selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/event-subscription/pods/%2A/event_subscription_current_message_lag_webhooks"
  },
  "items": []
}

...

{
  "kind": "MetricValueList",
  "apiVersion": "custom.metrics.k8s.io/v1beta1",
  "metadata": {
    "selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/event-subscription/pods/%2A/event_subscription_current_message_lag_webhook_retries"
  },
  "items": []
}

我对适配器如何能够找到我的原始指标、查询它、发布新指标感到困惑，但如果没有值，我希望在这种情况下是1.

4

0 回答 0