From f53c416a589068b111f2b0130bdf0a24aaaa48dc Mon Sep 17 00:00:00 2001
From: Jeff Robertson <jrobertson@hex.tech>
Date: Tue, 16 Sep 2025 21:26:02 -0400
Subject: [PATCH] support hpa behavior for haproxy chart

---
 haproxy/ci/deployment-hpa-values.yaml | 12 ++++++++++++
 haproxy/templates/hpa.yaml            |  3 +++
 haproxy/values.yaml                   |  5 +++++
 3 files changed, 20 insertions(+)

diff --git a/haproxy/ci/deployment-hpa-values.yaml b/haproxy/ci/deployment-hpa-values.yaml
index bb05e8d..0b03ff7 100644
--- a/haproxy/ci/deployment-hpa-values.yaml
+++ b/haproxy/ci/deployment-hpa-values.yaml
@@ -5,3 +5,15 @@ autoscaling:
   minReplicas: 1
   maxReplicas: 5
   targetCPUUtilizationPercentage: 80
+  behavior:
+    scaleUp:
+      policies:
+        - type: Percent
+          value: 900
+          periodSeconds: 60
+    scaleDown:
+      stabilizationWindowSeconds: 600
+      policies:
+        - type: Pods
+          value: 1
+          periodSeconds: 600
diff --git a/haproxy/templates/hpa.yaml b/haproxy/templates/hpa.yaml
index 7451146..74afeb8 100644
--- a/haproxy/templates/hpa.yaml
+++ b/haproxy/templates/hpa.yaml
@@ -36,6 +36,9 @@ spec:
     name: {{ include "haproxy.fullname" . }}
   minReplicas: {{ .Values.autoscaling.minReplicas }}
   maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  {{- if .Values.autoscaling.behavior }}
+  behavior: {{- toYaml .Values.autoscaling.behavior | nindent 4 }}
+  {{- end }}
   metrics:
   {{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
     - type: Resource
diff --git a/haproxy/values.yaml b/haproxy/values.yaml
index ef5c9f8..3f6ad26 100644
--- a/haproxy/values.yaml
+++ b/haproxy/values.yaml
@@ -440,6 +440,11 @@ autoscaling:
   #       target:
   #         type: Value
   #         value: 10k
+  ## Behavior
+  ## ref: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#configurable-scaling-behavior
+  # behavior:
+  #   scaleDown:
+  #      stabilizationWindowSeconds: 3600
 
 keda:
   enabled: false