MAJOR: kubernetes-ingress: Support to specify HPA behavior (#274)

Signed-off-by: Philipp Hossner <[email protected]>

Author: phihos

kubernetes-ingress/ci/deployment-hpa-values.yaml

@@ -4,6 +4,18 @@ controller:
     minReplicas: 1
     maxReplicas: 5
     targetCPUUtilizationPercentage: 80
+    behavior:
+      scaleUp:
+        policies:
+          - type: Percent
+            value: 900
+            periodSeconds: 60
+      scaleDown:
+        stabilizationWindowSeconds: 600
+        policies:
+          - type: Pods
+            value: 1
+            periodSeconds: 600
 
 defaultBackend:
   autoscaling:

kubernetes-ingress/templates/controller-hpa.yaml

@@ -44,6 +44,9 @@ spec:
     name: {{ include "kubernetes-ingress.fullname" . }}
   minReplicas: {{ .Values.controller.autoscaling.minReplicas }}
   maxReplicas: {{ .Values.controller.autoscaling.maxReplicas }}
+  {{- if .Values.controller.autoscaling.behavior }}
+  behavior: {{- toYaml .Values.controller.autoscaling.behavior | nindent 4 }}
+  {{- end }}
   metrics:
   {{- if .Values.controller.autoscaling.targetCPUUtilizationPercentage }}
     - type: Resource

kubernetes-ingress/values.yaml

@@ -235,6 +235,12 @@ controller:
     annotations: {}
     #  annotationKey: value
 
+    ## Behavior
+    ## ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#configurable-scaling-behavior
+    # behavior:
+    #   scaleDown:
+    #      stabilizationWindowSeconds: 3600
+
     ## Custom metrics (example)
     ## ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-multiple-metrics-and-custom-metrics
     # custom: