基于 Kubernetes HPA 的 Datadog 指标

编程问答 2022-05-01

问题描述

我最后几天正在阅读和使用基于 HPA 的 Datadog 指标。 在我把文件下

https://www.datadoghq.com/blog/autoscale-kubernetes-datadog/ https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/

这是我的 Datadogmetric

apiVersion: datadoghq.com/v1alpha1
kind: DatadogMetric
Metadata:
  name: deliver-rate
  namespace: beta
spec:
  query: rabbitmq.queue.messages.deliver.rate{environment:production,rabbitmq_queue:enqueue.xxx.callable}.as_count()

这是我的 HPA

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
Metadata:
  name: test-beta2
  namespace: beta
spec:
  minReplicas: 1
  maxReplicas: 8
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 10
      policies:
      - type: Pods
        value: 2
        periodSeconds: 2
    scaleUp:
      stabilizationWindowSeconds: 10
      policies:
      - type: Pods
        value: 2
        periodSeconds: 2
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: dealroom-xxx
  metrics:
    - type: External
      external:
        metric:
          name: 'datadogmetric@beta:deliver-rate'
        target:
          type: Value
          value: 200

我有两个问题

1.

当指标值高于定义的目标值时，所有这些都有效，但每次都没有以正确的方式扩大规模。例如，在 I 下放置 metricvalue/targetvalue 和适当的 desiredReplicas

desiredReplicas: 4   252/200
desiredReplicas: 6   252/200
desiredReplicas: 6   252/200
desiredReplicas: 5   240/200
desiredReplicas: 6   240/200
desiredReplicas: 6   240/200
desiredReplicas: 8   240/200

为什么自动缩放器添加的 pod 超过 2 个

  behavior:
    scaleDown:
      stabilizationWindowSeconds: 10
      policies:
      - type: Pods
        value: 2
        periodSeconds: 2
    scaleUp:
      stabilizationWindowSeconds: 10
      policies:
      - type: Pods
        value: 2
        periodSeconds: 2

2.

我定期看到 datadogmetric 的验证是错误的，但同时 datadogmetric 获取了指标并显示了值

deliver-rate True False 252 beta/test-beta2 9s

这是错误信息

HPA controller was able to get the target''s current scale"},{"type":"ScalingActive","status":"False","lastTransitionTime":"2021-05-15T14:32:01Z","reason":"FailedGetExternalMetric","message":"the
      HPA was unable to compute the replica count: unable to get external metric beta/datadogmetric@beta:deliver-rate/nil:
      unable to fetch metrics from external metrics API: Internal error occurred:
      DatadogMetric is invalid,err: Outdated result from backend,query: rabbitmq.queue.messages.deliver.rate{environment:production,rabbitmq_queue:enqueue.dealroom-PHP.callable}.as_count()"},{"type":"ScalingLimited","status":"True","lastTransitionTime":"2021-05-15T14:30:57Z","reason":"TooManyReplicas","message":"the
      desired replica count is more than the maximum replica count"}]'

谁能帮我解决这两个问题？

解决方法

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