add custom metric to hpa template

charts/ingress-nginx/values.yaml

@@ -243,6 +243,17 @@ controller:
     targetCPUUtilizationPercentage: 50
     targetMemoryUtilizationPercentage: 50
 
+  autoscalingTemplate: []
+  # Custom or additional autoscaling metrics
+  # ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#support-for-custom-metrics
+  # - type: Pods
+  #   pods:
+  #     metric:
+  #       name: nginx_ingress_controller_nginx_process_requests_total
+  #     target:
+  #       type: AverageValue
+  #       averageValue: 10000m
+
   ## Enable mimalloc as a drop-in replacement for malloc.
   ## ref: https://github.com/microsoft/mimalloc
   ##