From fe00b2de76fe39ada2593cd7a42a7a1624c2caea Mon Sep 17 00:00:00 2001
From: Timo Notheisen <65653426+tnotheis@users.noreply.github.com>
Date: Thu, 23 May 2024 10:07:23 +0200
Subject: [PATCH] Helm Chart: Scaling the event handler is not possible (#666)

* feat: make replicas configurable

* feat: add HorizontalPodAutoscaler
---
 helm/templates/eventhandler/deployment.yaml |  6 ++---
 helm/templates/eventhandler/hpa.yaml        | 28 +++++++++++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 helm/templates/eventhandler/hpa.yaml

diff --git a/helm/templates/eventhandler/deployment.yaml b/helm/templates/eventhandler/deployment.yaml
index 57c9ce8cf1..db3bcfd456 100644
--- a/helm/templates/eventhandler/deployment.yaml
+++ b/helm/templates/eventhandler/deployment.yaml
@@ -6,12 +6,12 @@ metadata:
     {{- include "global.labels" . | nindent 4 }}
     app: {{ .Values.eventhandler.name }}
 spec:
-  replicas: 1
+  replicas: {{ .Values.eventhandler.replicas }}
   strategy:
     type: RollingUpdate
     rollingUpdate:
-      maxSurge: {{ .Values.maxSurge }}
-      maxUnavailable: {{ .Values.maxUnavailable }}
+      maxSurge: {{ .Values.eventhandler.maxSurge }}
+      maxUnavailable: {{ .Values.eventhandler.maxUnavailable }}
   selector:
     matchLabels:
       app: {{ .Values.eventhandler.name }}
diff --git a/helm/templates/eventhandler/hpa.yaml b/helm/templates/eventhandler/hpa.yaml
new file mode 100644
index 0000000000..61095e6efb
--- /dev/null
+++ b/helm/templates/eventhandler/hpa.yaml
@@ -0,0 +1,28 @@
+{{- if .Values.eventhandler.autoscaling.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ .Values.eventhandler.name }}
+  labels:
+    {{- include "global.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ .Values.eventhandler.name }}
+  minReplicas: {{ .Values.eventhandler.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.eventhandler.autoscaling.maxReplicas }}
+  metrics:
+    {{- if .Values.eventhandler.autoscaling.targetCPUUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: cpu
+        targetAverageUtilization: {{ .Values.eventhandler.autoscaling.targetCPUUtilizationPercentage }}
+    {{- end }}
+    {{- if .Values.eventhandler.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        targetAverageUtilization: {{ .Values.eventhandler.autoscaling.targetMemoryUtilizationPercentage }}
+    {{- end }}
+{{- end }}