Fix previous helm chart issue for installation

[johnzheng1975]

One-line summary

Current chart is old and not work, I change the code based on the latest version, latest installation files under /docs.
I test and it works well.

Pls review, thanks.

Issue : #727

Description

A few sentences describing the overall goals of the pull request's
commits.

Note:
Current helm charts does not work ./docs/helm
You can install it successfully, but never work.
If you run cd docs; kubectl apply -f ., it can work.

If you view current helm charts,

• The version is old.
• The values are not expected.
• Even some status inside template .
  It may not professional enough for such a good product.

BTW, feel free to modify if necessary.

Types of Changes

What types of changes does your code introduce? Keep the ones that apply:

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Configuration change
• Refactor/improvements
• Documentation / non-code

Tasks

List of tasks you will do to complete the PR

• Created Task 1
• Created Task 2
• To-do Task 3

Review

List of tasks the reviewer must do to review the PR

• Tests
• Documentation
• CHANGELOG

Deployment Notes

These should highlight any db migrations, feature toggles, etc.

[johnzheng1975]

I test with below, and works well.

1. Install with below

---
apiVersion: source.toolkit.fluxcd.io/v1
kind: GitRepository
metadata:
  namespace: flux-system
  name: kube-metrics-adapter
spec:
  interval: 5m # The interval at which to reconcile the Helm release
  url: https://github.com/johnzheng1975/kube-metrics-adapter.git
  ref:
    tag: v0.2.2
---
apiVersion: helm.toolkit.fluxcd.io/v2beta2
kind: HelmRelease
metadata:
  namespace: infra
  name: kube-metrics-adapter
spec:
  interval: 5m # The interval at which to reconcile the Helm release
  releaseName: kube-metrics-adapter
  targetNamespace: infra
  chart:
    spec:
      chart: ./docs/helm
      sourceRef:
        kind: GitRepository
        name: kube-metrics-adapter
        namespace: flux-system
  values:
    prometheus:
      server: "http://prometheus-server.infra.svc.cluster.local:9090"

Step 2: Create hpa

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: aiservice
  namespace: zone-dev
  annotations:
    metric-config.external.dcgm-fi-dev-gpu-util.prometheus/prometheus-server: http://prometheus-server.infra.svc
    metric-config.external.dcgm-fi-dev-gpu-util.prometheus/query: |
     avg(
       avg_over_time(
         DCGM_FI_DEV_GPU_UTIL{
           app="nvidia-dcgm-exporter",
           container="service",
           exported_namespace="zone-dev",
           pod=~"aiservice-.*",
           service="nvidia-dcgm-exporter"
         }[1m]
       )
     )
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: aiservice
  minReplicas: 1
  maxReplicas: 5
  metrics:
  - type: External
    external:
      metric:
        name: dcgm-fi-dev-gpu-util
        selector:
          matchLabels:
            type: prometheus
      target:
        type: AverageValue
        averageValue: "50"

Step 3: It is useful as below.

[szuecs]

👍

[mikkeloscar]

👍