feat: allow to configure autoscaling with keda ScaledObject

README.md

@@ -70,6 +70,7 @@ please refer to [the official krakend documentation](https://www.krakend.io/docs
 | ingress.className | string | `""` | The class to use for the ingress |
 | ingress.enabled | bool | `false` | Specifies whether an ingress should be created |
 | ingress.hosts | list | `[{"host":"chart-example.local","paths":[{"path":"/","pathType":"ImplementationSpecific"}]}]` | The list of hosts to use for the ingress |
+| keda | object | `{"behavior":{},"cooldownPeriod":300,"enabled":false,"maxReplicas":3,"minReplicas":1,"pollingInterval":30,"restoreToOriginalReplicaCount":false,"scaledObject":{"annotations":{}},"triggers":[]}` | Configures a keda ScaledObject for your Deployment. It's mutually exclusive with hpa autoscaling |
 | krakend.allInOneImage | bool | `false` | Whether the given krakend image to be used contains everything needed for the krakend service to run. If set to false, the image will be used as a base image and the configuration will be loaded from the configmap. Note that the all-in-one image assumes the krakend configuration is located at /etc/krakend-src/config/krakend.tmpl |
 | krakend.config | string, optional | `""` | If set, this key will contain the full configuration of the krakend service |
 | krakend.configFileSource | string, optional | `""` | an external file relative path, will contain the full configuration of the krakend service. useful if config file is generated with flexible config https://www.krakend.io/docs/configuration/flexible-config/ |

templates/deployment.yaml

@@ -10,7 +10,7 @@ metadata:
   labels:
     {{- include "krakend.labels" . | nindent 4 }}
 spec:
-  {{- if not .Values.autoscaling.enabled }}
+  {{- if eq .Values.autoscaling.enabled .Values.keda.enabled }}
   replicas: {{ .Values.replicaCount }}
   {{- end }}
   selector:

templates/hpa.yaml

@@ -1,4 +1,4 @@
-{{- if and (eq .Values.deploymentType "deployment") .Values.autoscaling.enabled }}
+{{- if and (eq .Values.deploymentType "deployment") .Values.autoscaling.enabled (not .Values.keda.enabled) }}
 apiVersion: {{ ternary "autoscaling/v2" "autoscaling/v2beta2" (.Capabilities.APIVersions.Has "autoscaling/v2") }}
 kind: HorizontalPodAutoscaler
 metadata:

templates/keda.yaml

@@ -0,0 +1,37 @@
+{{- if and (eq .Values.deploymentType "deployment") .Values.keda.enabled (not .Values.autoscaling.enabled) -}}
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: {{ include "krakend.fullname" . }}
+  labels:
+    {{- include "krakend.labels" . | nindent 4 }}
+  {{- if .Values.keda.scaledObject.annotations }}
+  annotations: {{ toYaml .Values.keda.scaledObject.annotations | nindent 4 }}
+  {{- end }}
+spec:
+  scaleTargetRef:
+    name: {{ include "krakend.fullname" . }}
+  pollingInterval: {{ .Values.keda.pollingInterval }}
+  cooldownPeriod: {{ .Values.keda.cooldownPeriod }}
+  minReplicaCount: {{ .Values.keda.minReplicas }}
+  maxReplicaCount: {{ .Values.keda.maxReplicas }}
+{{- with .Values.keda.fallback }}
+  fallback:
+    failureThreshold: {{ .failureThreshold | default 3 }}
+    replicas: {{ .replicas | default $.Values.keda.maxReplicas }}
+{{- end }}
+  triggers:
+{{- with .Values.keda.triggers }}
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+  advanced:
+    restoreToOriginalReplicaCount: {{ .Values.keda.restoreToOriginalReplicaCount }}
+{{- if .Values.keda.behavior }}
+    horizontalPodAutoscalerConfig:
+      behavior:
+{{- with .Values.keda.behavior }}
+{{- toYaml . | nindent 8 }}
+{{- end }}
+
+{{- end }}
+{{- end }}

values.yaml

@@ -299,3 +299,38 @@ autoscaling:
   #   - type: Pods
   #     value: 2
   #     periodSeconds: 60
+
+# -- (object) Configures a keda ScaledObject for your Deployment.
+# It's mutually exclusive with hpa autoscaling
+keda:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 3
+  pollingInterval: 30
+  cooldownPeriod: 300
+  # fallback:
+  #   failureThreshold: 3
+  #   replicas: 11
+  restoreToOriginalReplicaCount: false
+  scaledObject:
+    annotations: {}
+  triggers: []
+  # - type: prometheus
+  #   metadata:
+  #     serverAddress: http://<prometheus-host>:9090
+  #     metricName: http_requests_total
+  #     threshold: '100'
+  #     query: sum(rate(http_requests_total{deployment="my-deployment"}[2m]))
+  behavior: {}
+  # scaleDown:
+  #   stabilizationWindowSeconds: 300
+  #   policies:
+  #   - type: Pods
+  #     value: 1
+  #     periodSeconds: 180
+  # scaleUp:
+  #   stabilizationWindowSeconds: 300
+  #   policies:
+  #   - type: Pods
+  #     value: 2
+  #     periodSeconds: 60