Dbp 1021 adapt spsh helm charts for autoscaling (#748)

Dbp 1021 adapt spsh helm charts for autoscaling (#748)

charts/dbildungs-iam-server/templates/backend-deployment.yaml

@@ -7,7 +7,9 @@ metadata:
     {{- include "common.labels" . | nindent 4 }}
     app.kubernetes.io/component: server-backend
 spec:
+  {{- if not .Values.autoscaling.enabled }}
   replicas: {{ .Values.backend.replicaCount }}
+  {{- end }}
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ template "common.names.name" . }}

charts/dbildungs-iam-server/templates/hpa.yaml

@@ -0,0 +1,32 @@
+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "common.names.name" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: {{ include "common.names.name" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/version: {{ .Chart.AppVersion }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "common.names.name" . }}-backend   
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  behavior:
+    scaleDown:
+      policies:
+        - type: Percent
+          value: 100      
+          periodSeconds: 60 
+  metrics:
+    - type: Resource
+      resource:
+        name: cpu
+        target:
+          type: Utilization
+          averageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+{{- end }}

charts/dbildungs-iam-server/values.yaml

@@ -167,12 +167,9 @@ redis-cluster:
       memory: 128Mi
   metrics:
     enabled: true
-    resources:
-      limits:
-        cpu: 200m
-        memory: 256Mi
-      requests:
-        cpu: 50m
-        memory: 64Mi
-    serviceMonitor: 
-        enabled: true
+
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 5
+  targetCPUUtilizationPercentage: 60