# Gateway HPA — 流量入口, 流量波动大
{{- $svc := .Values.services.gateway -}}
{{- if and $svc.enabled $svc.hpa.enabled }}
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: {{ include "topfans.fullname" . }}-gateway
  namespace: {{ .Values.namespace.name | default "topfans" }}
  labels:
    {{- include "topfans.labels" . | nindent 4 }}
    app.kubernetes.io/component: gateway
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: {{ include "topfans.fullname" . }}-gateway
  minReplicas: {{ $svc.hpa.minReplicas | default 2 }}
  maxReplicas: {{ $svc.hpa.maxReplicas | default 10 }}
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: {{ $svc.hpa.targetCPU | default 60 }}
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300    # 5 min 内不连续降
    scaleUp:
      stabilizationWindowSeconds: 30
      policies:
      - type: Percent
        value: 100
        periodSeconds: 60
{{- end }}