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feat: Support autoscaling via HPA (#268)
* feat: expose autoscaling configuration using the HPA resource Signed-off-by: Armel Soro <[email protected]> * Set the Deployment replicas only if autoscaling is not enabled When autoscaling is enabled, the HPA controller controls the number of replicas [1] [1] https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/\#migrating-deployments-and-statefulsets-to-horizontal-autoscaling Signed-off-by: Armel Soro <[email protected]> * Add CI values file with autoscaling enabled Signed-off-by: Armel Soro <[email protected]> * Bump chart version This is a backward-compatible change Signed-off-by: Armel Soro <[email protected]> * Update values schema Signed-off-by: Armel Soro <[email protected]> * Update README Signed-off-by: Armel Soro <[email protected]> --------- Signed-off-by: Armel Soro <[email protected]>
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‎charts/backstage/Chart.yaml‎

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# This is the chart version. This version number should be incremented each time you make changes
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# to the chart and its templates, including the app version.
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# Versions are expected to follow Semantic Versioning (https://semver.org/)
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version: 2.5.3
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version: 2.6.0

‎charts/backstage/README.md‎

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# Backstage Helm Chart
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[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/backstage)](https://artifacthub.io/packages/search?repo=backstage)
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![Version: 2.5.3](https://img.shields.io/badge/Version-2.5.3-informational?style=flat-square)
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![Version: 2.6.0](https://img.shields.io/badge/Version-2.6.0-informational?style=flat-square)
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![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
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A Helm chart for deploying a Backstage application
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| backstage.annotations | Additional custom annotations for the `Deployment` resource | object | `{}` |
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| backstage.appConfig | Generates ConfigMap and configures it in the Backstage pods | object | `{}` |
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| backstage.args | Backstage container command arguments | list | `[]` |
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| backstage.autoscaling | Autoscaling configuration. <br /> Ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/ | object | `{"enabled":false,"maxReplicas":100,"minReplicas":1,"targetCPUUtilizationPercentage":80}` |
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| backstage.command | Backstage container command | list | `["node","packages/backend"]` |
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| backstage.containerPorts | Container ports on the Deployment | object | `{"backend":7007}` |
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| backstage.containerSecurityContext | Security settings for a Container. <br /> Ref: https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-container | object | `{}` |

‎charts/backstage/ci/autoscaling-values.yaml‎

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backstage:
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autoscaling:
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enabled: true
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minReplicas: 1
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maxReplicas: 3
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targetCPUUtilizationPercentage: 75
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targetMemoryUtilizationPercentage: 90

‎charts/backstage/templates/backstage-deployment.yaml‎

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{{- include "common.tplvalues.render" ( dict "value" .Values.backstage.annotations "context" $) | nindent 4 }}
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{{- end }}
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spec:
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{{- if not .Values.backstage.autoscaling.enabled }}
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replicas: {{ .Values.backstage.replicas }}
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{{- end }}
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revisionHistoryLimit: {{ .Values.backstage.revisionHistoryLimit }}
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selector:
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matchLabels: {{- include "common.labels.matchLabels" . | nindent 6 }}

‎charts/backstage/templates/hpa.yaml‎

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{{- if .Values.backstage.autoscaling.enabled }}
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apiVersion: autoscaling/v2
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kind: HorizontalPodAutoscaler
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metadata:
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name: {{ include "common.names.fullname" . }}
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namespace: {{ .Release.Namespace | quote }}
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labels: {{ include "common.labels.standard" . | nindent 4 }}
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app.kubernetes.io/component: backstage
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{{- if .Values.commonLabels }}
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{{- include "common.tplvalues.render" ( dict "value" .Values.commonLabels "context" $ ) | nindent 4 }}
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{{- end }}
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annotations:
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{{- if .Values.commonAnnotations }}
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{{- include "common.tplvalues.render" ( dict "value" .Values.commonAnnotations "context" $ ) | nindent 4 }}
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{{- end }}
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{{- if .Values.backstage.annotations }}
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{{- include "common.tplvalues.render" ( dict "value" .Values.backstage.annotations "context" $) | nindent 4 }}
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{{- end }}
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spec:
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scaleTargetRef:
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apiVersion: apps/v1
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kind: Deployment
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name: {{ include "common.names.fullname" . }}
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minReplicas: {{ .Values.backstage.autoscaling.minReplicas }}
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maxReplicas: {{ .Values.backstage.autoscaling.maxReplicas }}
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metrics:
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{{- if .Values.backstage.autoscaling.targetCPUUtilizationPercentage }}
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- type: Resource
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resource:
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name: cpu
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target:
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type: Utilization
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averageUtilization: {{ .Values.backstage.autoscaling.targetCPUUtilizationPercentage }}
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{{- end }}
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{{- if .Values.backstage.autoscaling.targetMemoryUtilizationPercentage }}
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- type: Resource
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resource:
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name: memory
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target:
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type: Utilization
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averageUtilization: {{ .Values.backstage.autoscaling.targetMemoryUtilizationPercentage }}
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{{- end }}
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{{- end }}

‎charts/backstage/values.schema.json‎

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"title": "Backstage container command arguments",
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"type": "array"
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},
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"autoscaling": {
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"default": false,
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"description": "Enable autoscaling",
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"title": "Backstage Autoscaling",
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"type": "boolean"
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},
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"maxReplicas": {
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"default": 100,
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"title": "Maximum number of Backstage pod replicas that the autoscaler is allowed to scale up to",
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"type": "integer"
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},
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"minReplicas": {
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"default": 1,
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"title": "Minimum number of Backstage pod replicas that the autoscaler is allowed to scale down to",
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"type": "integer"
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},
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"targetCPUUtilizationPercentage": {
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"default": 80,
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"title": "Percentage of CPU that each Backstage pod should be using on average before the autoscaler decides to scale",
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"type": "integer"
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},
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"targetMemoryUtilizationPercentage": {
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"title": "Percentage of memory that each Backstage pod should be using on average before the autoscaler decides to scale",
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"type": "integer"
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}
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},
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"title": "Autoscaling parameters",
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"type": "object"
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},
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"command": {
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"default": [
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"node",
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"description": "Represents a Glusterfs mount that lasts the lifetime of a pod. Glusterfs volumes do not support ownership management or SELinux relabeling.",
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"properties": {
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"endpoints": {
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"description": "endpoints is the endpoint name that details Glusterfs topology. More info: https://examples.k8s.io/volumes/glusterfs/README.md#create-a-pod",
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"description": "endpoints is the endpoint name that details Glusterfs topology.",
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"type": "string"
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},
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"path": {

‎charts/backstage/values.schema.tmpl.json‎

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}
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}
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},
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"autoscaling": {
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"title": "Autoscaling parameters",
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"description": "Enable autoscaling",
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"title": "Backstage Autoscaling",
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"type": "boolean",
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"default": false
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},
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"minReplicas": {
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"title": "Minimum number of Backstage pod replicas that the autoscaler is allowed to scale down to",
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"type": "integer",
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"default": 1
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},
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"maxReplicas": {
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"title": "Maximum number of Backstage pod replicas that the autoscaler is allowed to scale up to",
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"type": "integer",
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"default": 100
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},
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"targetCPUUtilizationPercentage": {
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"title": "Percentage of CPU that each Backstage pod should be using on average before the autoscaler decides to scale",
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"type": "integer",
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"default": 80
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},
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"targetMemoryUtilizationPercentage": {
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"title": "Percentage of memory that each Backstage pod should be using on average before the autoscaler decides to scale",
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"type": "integer"
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}
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}
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},
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"pdb": {
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"title": "PDB parameters",
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"type": "object",

‎charts/backstage/values.yaml‎

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minAvailable: ""
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maxUnavailable: ""
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# -- Autoscaling configuration.
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# <br /> Ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/
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autoscaling:
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enabled: false
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minReplicas: 1
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maxReplicas: 100
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targetCPUUtilizationPercentage: 80
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# targetMemoryUtilizationPercentage: 80
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# -- Container ports on the Deployment
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containerPorts:
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backend: 7007

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