HELM-39: Add Horizontal Scaling

Signed-off-by: GridexX <arsene582@gmail.com>

charts/xwiki/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 description: XWiki is a free wiki software platform written in Java with a design emphasis on extensibility. XWiki is an enterprise wiki. It includes WYSIWYG editing, OpenDocument based document import/export, semantic annotations and tagging, and advanced permissions management.
 name: xwiki
-version: 1.2.0-Beta.7
+version: 1.2.0-Beta.8
 type: application
 keywords:
 - xwiki

charts/xwiki/templates/hpa.yaml

@@ -0,0 +1,29 @@
+{{- $fullName := include "xwiki.fullname" . -}}
+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "xwiki.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    {{- if .Values.workloadStateful }}
+    apiVersion: {{ include "common.capabilities.statefulset.apiVersion" . }}
+    kind: StatefulSet
+    {{- else }}
+    apiVersion: {{ include "common.capabilities.deployment.apiVersion" . }}
+    kind: Deployment
+    {{- end }}
+    name: {{ $fullName }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  {{- with .Values.autoscaling.metrics }}
+  metrics:
+    {{- toYaml .Values.autoscaling.metrics | nindent 6 }}
+  {{- end }}
+{{- with .Values.autoscaling.status }}
+status:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- end }}

charts/xwiki/values.yaml

@@ -335,3 +335,31 @@ logback:
 #  extraConfiguration: |
 #    <logger name="org.xwiki" level="debug"/>
 #    <logger name="com.xwiki" level="debug"/>
+
+# Enable Autoscaling for the xwiki deployment/statefullSet:
+# https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/
+autoscaling:
+  enabled: true
+  minReplicas: 1
+  maxReplicas: 3
+  # Custom metrics to trigger the Autoscaling
+  # https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-multiple-metrics-and-custom-metrics
+  metrics: {}
+  # - type: Resource
+  #   resource:
+  #     name: cpu
+  #     target:
+  #       type: Utilization
+  #       averageUtilization: 50
+  status: {}
+  # observedGeneration: 1
+  # lastScaleTime: <some-time>
+  # currentReplicas: 1
+  # desiredReplicas: 1
+  # currentMetrics:
+  # - type: Resource
+  #   resource:
+  #     name: cpu
+  #     current:
+  #       averageUtilization: 0
+  #       averageValue: 0