Deployment + Service + HPA

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  labels: { app: myapp }
spec:
  replicas: 2
  selector:
    matchLabels: { app: myapp }
  template:
    metadata:
      labels: { app: myapp }
    spec:
      containers:
        - name: myapp
          image: registry.example.com/myapp:latest
          ports: [{ containerPort: 8080 }]
          readinessProbe:
            httpGet: { path: /health, port: 8080 }
            initialDelaySeconds: 5
          livenessProbe:
            httpGet: { path: /health, port: 8080 }
            initialDelaySeconds: 15
            periodSeconds: 20
          resources:
            requests: { cpu: "100m", memory: "128Mi" }
            limits:   { cpu: "500m", memory: "512Mi" }
---
apiVersion: v1
kind: Service
metadata: { name: myapp }
spec:
  selector: { app: myapp }
  ports: [{ port: 80, targetPort: 8080 }]
---
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata: { name: myapp }
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myapp
  minReplicas: 2
  maxReplicas: 10
  metrics:
    - type: Resource
      resource:
        name: cpu
        target: { type: Utilization, averageUtilization: 70 }