add support for pod disruption budget (helm#13220)

* add support for pod disruption budget

Signed-off-by: Jay Howard <jay.howard@rmn.com>

* explicitly support current pod disruption budget options

Signed-off-by: Jay Howard <jay.howard@rmn.com>

* lint: add newline at end of file

Signed-off-by: Jay Howard <jay.howard@rmn.com>

stable/metrics-server/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: 0.3.2
 description: Metrics Server is a cluster-wide aggregator of resource usage data.
 name: metrics-server
-version: 2.6.0
+version: 2.7.0
 keywords:
 - metrics-server
 home: https://github.com/kubernetes-incubator/metrics-server

stable/metrics-server/README.md

@@ -31,3 +31,6 @@ Parameter | Description | Default
 `service.annotations` | Annotations to add to the service | `{}`
 `service.port` | Service port to expose | `443`
 `service.type` | Type of service to create | `ClusterIP`
+`podDisruptionBudget.enabled` | Create a PodDisruptionBudget | `false`
+`podDisruptionBudget.minAvailable` | Minimum available instances; ignored if there is no PodDisruptionBudget | `1`
+`podDisruptionBudget.maxUnavailable` | Maximum unavailable instances; ignored if there is no PodDisruptionBudget | `1`

stable/metrics-server/templates/pdb.yaml

@@ -0,0 +1,23 @@
+{{- if .Values.podDisruptionBudget.enabled -}}
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  labels:
+    app: {{ template "metrics-server.name" . }}
+    chart: {{ template "metrics-server.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+  name: {{ template "metrics-server.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+
+spec:
+  {{- if .Values.podDisruptionBudget.minAvailable }}
+  minAvailable: {{ .Values.podDisruptionBudget.minAvailable }}
+  {{- end  }}
+  {{- if .Values.podDisruptionBudget.maxUnavailable }}
+  maxUnavailable: {{ .Values.podDisruptionBudget.maxUnavailable }}
+  {{- end  }}
+  selector:
+    matchLabels:
+      app: {{ template "metrics-server.name" . }}
+{{- end -}}

stable/metrics-server/values.yaml

@@ -90,3 +90,9 @@ service:
   annotations: {}
   port: 443
   type: ClusterIP
+
+podDisruptionBudget:
+  # https://kubernetes.io/docs/tasks/run-application/configure-pdb/
+  enabled: false
+  minAvailable: 1
+  maxUnavailable: 1