Add pdb to fluentd helm chart

charts/fluentd/templates/_helpers.tpl

@@ -91,6 +91,19 @@ Name of the configMap used for additional configuration files; allows users to o
 {{- end -}}
 {{- end -}}
 
+
+{{/*
+Pdb apiVersion according k8s version and capabilities
+*/}}
+{{- define "fluentd.pdb.apiVersion" -}}
+{{- if and (.Capabilities.APIVersions.Has "policy/v1") (semverCompare ">=1.21-0" .Capabilities.KubeVersion.GitVersion) -}}
+policy/v1
+{{- else -}}
+policy/v1beta1
+{{- end }}
+{{- end -}}
+
+
 {{/*
 HPA ApiVersion according k8s version
 Check legacy first so helm template / kustomize will default to latest version
@@ -101,4 +114,4 @@ autoscaling/v2beta2
 {{- else -}}
 autoscaling/v2
 {{- end -}}
-{{- end -}}
+{{- end -}}

charts/fluentd/templates/pdb.yaml

@@ -0,0 +1,21 @@
+{{- if and  (or ( eq .Values.kind "Deployment" )  ( eq .Values.kind "StatefulSet" ))  .Values.podDisruptionBudget.enabled }}
+apiVersion: {{ include "fluentd.pdb.apiVersion" . }}
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "fluentd.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "fluentd.labels" . | nindent 4 }}
+{{- with .Values.podDisruptionBudget.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+{{- end }}
+spec:
+  maxUnavailable: {{ .Values.podDisruptionBudget.maxUnavailable }}
+  selector:
+    matchLabels:
+      {{- include "fluentd.selectorLabels" . | nindent 6 }}
+      {{- with .Values.labels }}
+        {{- toYaml . | nindent 6 }}
+      {{- end }}
+{{- end }}

charts/fluentd/values.yaml

@@ -403,3 +403,10 @@ ingress:
   # - secretName: fluentd-tls
   #   hosts:
   #     - fluentd.example.tld
+
+
+## only available if kind is Deployment or StatefulSet
+podDisruptionBudget:
+  enabled: false
+  annotations: {}
+  maxUnavailable: "30%"