feat: Add Pod Disruption Budget configuration to Helm chart

Author: bmlyr

helm/polaris/templates/poddisruptionbudget.yaml

@@ -0,0 +1,42 @@
+{{/*
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+ 
+   http://www.apache.org/licenses/LICENSE-2.0
+ 
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+*/}}
+
+{{- if .Values.podDisruptionBudget.enabled -}}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "polaris.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "polaris.labels" . | nindent 4 }}
+  {{- if .Values.podDisruptionBudget.annotations }}
+  annotations:
+    {{- tpl (toYaml .Values.podDisruptionBudget.annotations) . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- if .Values.podDisruptionBudget.minAvailable }}
+  minAvailable: {{ .Values.podDisruptionBudget.minAvailable }}
+  {{- end }}
+  {{- if .Values.podDisruptionBudget.maxUnavailable }}
+  maxUnavailable: {{ .Values.podDisruptionBudget.maxUnavailable }}
+  {{- end }}
+  selector:
+    matchLabels:
+      {{- include "polaris.selectorLabels" . | nindent 6 }}
+{{- end }}

helm/polaris/values.yaml

@@ -62,6 +62,21 @@ podLabels: {}
 # -- Additional Labels to apply to polaris configmap.
 configMapLabels: {}
 
+# -- Pod disruption budget settings.
+podDisruptionBudget:
+  # -- Specifies whether a pod disruption budget should be created.
+  enabled: false
+  # -- The minimum number of pods that should remain available during disruptions.
+  # Can be an absolute number (ex: 5) or a percentage of desired pods (ex: 50%).
+  # Cannot be used if maxUnavailable is set.
+  minAvailable: ~
+  # -- The maximum number of pods that can be unavailable during disruptions.
+  # Can be an absolute number (ex: 5) or a percentage of desired pods (ex: 50%).
+  # Cannot be used if minAvailable is set.
+  maxUnavailable: 1
+  # -- Annotations to add to the pod disruption budget.
+  annotations: {}
+
 # -- The number of old ReplicaSets to retain to allow rollback (if not set, the default Kubernetes value is set to 10).
 revisionHistoryLimit: ~