From 34403dcf87245daaa29337b789a69dc2a98c7bbb Mon Sep 17 00:00:00 2001
From: Fabrizio Cafolla <developer@fabriziocafolla.com>
Date: Fri, 15 May 2026 12:36:24 +0200
Subject: [PATCH] feat(chart): add support for autoscaling behavior in HPA
 (#27990)

Squash-merged by litellm-agent from FabrizioCafolla's PR.
---
 deploy/charts/litellm-helm/templates/hpa.yaml |  4 +++
 .../charts/litellm-helm/tests/hpa_tests.yaml  | 36 +++++++++++++++++++
 deploy/charts/litellm-helm/values.yaml        |  1 +
 3 files changed, 41 insertions(+)
 create mode 100644 deploy/charts/litellm-helm/tests/hpa_tests.yaml

diff --git a/deploy/charts/litellm-helm/templates/hpa.yaml b/deploy/charts/litellm-helm/templates/hpa.yaml
index 71e199c5aeb..fec4d1f5c5e 100644
--- a/deploy/charts/litellm-helm/templates/hpa.yaml
+++ b/deploy/charts/litellm-helm/templates/hpa.yaml
@@ -12,6 +12,10 @@ spec:
     name: {{ include "litellm.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.targetCPUUtilizationPercentage }}
     - type: Resource
diff --git a/deploy/charts/litellm-helm/tests/hpa_tests.yaml b/deploy/charts/litellm-helm/tests/hpa_tests.yaml
new file mode 100644
index 00000000000..ec18c3591d3
--- /dev/null
+++ b/deploy/charts/litellm-helm/tests/hpa_tests.yaml
@@ -0,0 +1,36 @@
+suite: "hpa with behavior"
+templates:
+  - hpa.yaml
+tests:
+  - it: "renders behavior when set"
+    set:
+      autoscaling.enabled: true
+      autoscaling.behavior:
+        scaleUp:
+          stabilizationWindowSeconds: 60
+          policies:
+            - type: Pods
+              value: 2
+              periodSeconds: 60
+        scaleDown:
+          stabilizationWindowSeconds: 90
+          policies:
+            - type: Pods
+              value: 1
+              periodSeconds: 60
+    asserts:
+      - isKind: { of: HorizontalPodAutoscaler }
+      - equal: { path: spec.behavior.scaleUp.stabilizationWindowSeconds, value: 60 }
+      - equal: { path: spec.behavior.scaleDown.stabilizationWindowSeconds, value: 90 }
+
+---
+suite: "hpa without behavior"
+templates:
+  - hpa.yaml
+tests:
+  - it: "does not render behavior when not set"
+    set:
+      autoscaling.enabled: true
+    asserts:
+      - isKind: { of: HorizontalPodAutoscaler }
+      - isNull: { path: spec.behavior }
diff --git a/deploy/charts/litellm-helm/values.yaml b/deploy/charts/litellm-helm/values.yaml
index 9c7c013341b..81558ed5b29 100644
--- a/deploy/charts/litellm-helm/values.yaml
+++ b/deploy/charts/litellm-helm/values.yaml
@@ -184,6 +184,7 @@ autoscaling:
   maxReplicas: 100
   targetCPUUtilizationPercentage: 80
   # targetMemoryUtilizationPercentage: 80
+  # behavior: {}
 
 # Autoscaling with keda is mutually exclusive with hpa
 keda: