added optional HPA (cpu/memory) to Helm chart

chart/stable/podinfo/templates/hpa.yaml

@@ -0,0 +1,22 @@
+{{- if .Values.hpa.enabled -}}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "podinfo.fullname" . }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1beta2
+    kind: Deployment
+    name: {{ template "podinfo.fullname" . }}
+  minReplicas: {{ .Values.replicaCount }}
+  maxReplicas: {{ .Values.hpa.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      targetAverageUtilization: {{ .Values.hpa.cpu }}
+  - type: Resource
+    resource:
+      name: memory
+      targetAverageValue: {{ .Values.hpa.memory }}
+{{- end }}

chart/stable/podinfo/values.yaml

@@ -1,6 +1,4 @@
 # Default values for podinfo.
-# This is a YAML-formatted file.
-# Declare variables to be passed into your templates.
 
 replicaCount: 1
 
@@ -15,6 +13,12 @@ service:
   containerPort: 9898
   nodePort: 31198
 
+hpa:
+  enabled: false
+  maxReplicas: 10
+  cpu: 80
+  memory: 200Mi
+
 ingress:
   enabled: false
   annotations: {}