Add initial K8s web HPA.

Author: simi

config/deploy/production/web-hpa.yaml.erb

@@ -0,0 +1 @@
+../web-hpa.yaml.erb

config/deploy/staging/web-hpa.yaml.erb

@@ -0,0 +1 @@
+../web-hpa.yaml.erb

config/deploy/web-hpa.yaml.erb

@@ -0,0 +1,38 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: web-hpa
+  labels:
+    app: web
+    environment: <%= environment %>
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: web
+  minReplicas: 3
+  maxReplicas: 10
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 75
+  behavior:
+    scaleDown:
+      stabilizationWindowSeconds: 300
+      policies:
+      - type: Percent
+        value: 50
+        periodSeconds: 60
+    scaleUp:
+      stabilizationWindowSeconds: 60
+      policies:
+      - type: Percent
+        value: 100
+        periodSeconds: 60
+      - type: Pods
+        value: 2
+        periodSeconds: 60
+      selectPolicy: Max

config/deploy/web.yaml.erb

@@ -5,6 +5,7 @@ metadata:
   annotations:
     shipit.shopify.io/restart: 'true'
 spec:
+  replicas: <%= environment == 'production' ? 3 : 2 %>
   strategy:
     type: RollingUpdate
     rollingUpdate: