feat: add HPA-based pod autoscaling to okd deployments

charts/openvsx/templates/deployment.yaml

@@ -9,7 +9,9 @@ metadata:
 spec:
   progressDeadlineSeconds: 3600
   revisionHistoryLimit: 1
+  {{- if not .Values.autoscaling.enabled }}
   replicas: {{ .Values.replicaCount }}
+  {{- end }}
   selector:
     matchLabels:
       app: {{ .Values.name }}

charts/openvsx/templates/okd-hpa.yaml

@@ -0,0 +1,46 @@
+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ .Values.name }}-{{ .Values.environment }}-{{ .Values.platform }}-hpa
+  namespace: {{ .Values.namespace }}
+  labels:
+    app: {{ .Values.name }}
+    environment: {{ .Values.environment }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ .Values.name }}-{{ .Values.environment }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+  - type: Resource
+    resource:
+      name: memory
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
+  behavior:
+    scaleDown:
+      # Look at the last N minutes and pick the HIGHEST replica count recommended.
+      # This ensures we don't scale down during a brief dip in traffic.
+      stabilizationWindowSeconds: {{ .Values.autoscaling.scaleDownWindow | default 600 }}
+      policies:
+      - type: Percent
+        value: 10
+        periodSeconds: 60  # Only remove 10% of pods per minute
+    scaleUp:
+      # Scale up almost immediately to handle spikes quickly.
+      stabilizationWindowSeconds: 0
+      policies:
+      - type: Percent
+        value: 100
+        periodSeconds: 15  # Double the fleet size every 15s if needed
+{{- end }}

charts/openvsx/values-staging.yaml

@@ -4,10 +4,19 @@ name: &name open-vsx-org
 environment: &environment staging
 namespace: &namespace open-vsx-org-staging
 host: staging.open-vsx.org
+platform: okd
 
 replicaCount: 1
 esReplicaCount: 1
 
+autoscaling:
+  enabled: true
+  minReplicas: 1
+  maxReplicas: 3
+  targetCPUUtilizationPercentage: 70
+  targetMemoryUtilizationPercentage: 80
+  scaleDownWindow: 300
+
 image:
   repository: ghcr.io/eclipsefdn/openvsx-website
   pullPolicy: Always

charts/openvsx/values-test.yaml

@@ -4,10 +4,14 @@ name: &name open-vsx-org
 environment: &environment test
 namespace: &namespace open-vsx-org-test
 host: test.open-vsx.org
+platform: okd
 
 replicaCount: 1
 esReplicaCount: 1
 
+autoscaling:
+  enabled: false
+
 image:
   repository: ghcr.io/eclipsefdn/openvsx-website
   pullPolicy: Always

charts/openvsx/values.yaml

@@ -4,10 +4,19 @@ name: &name open-vsx-org
 environment: &environment production
 namespace: &namespace open-vsx-org
 host: open-vsx.org
+platform: okd
 
 replicaCount: 6
 esReplicaCount: 3
 
+autoscaling:
+  enabled: false
+  # minReplicas: 6
+  # maxReplicas: 12
+  # targetCPUUtilizationPercentage: 70
+  # targetMemoryUtilizationPercentage: 80
+  # scaleDownWindow: 600
+
 image:
   repository: ghcr.io/eclipsefdn/openvsx-website
   pullPolicy: Always