stable/grafana: add pod disruption budget (#17916)

Signed-off-by: Josh Switnicki <switj@autonomic.ai>

stable/grafana/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: grafana
-version: 3.10.0
+version: 3.10.1
 appVersion: 6.4.2
 kubeVersion: "^1.8.0-0"
 description: The leading tool for querying and visualizing time series and metrics.

stable/grafana/README.md

@@ -32,6 +32,8 @@ The command removes all the Kubernetes components associated with the chart and
 | Parameter                                 | Description                                   | Default                                                 |
 |-------------------------------------------|-----------------------------------------------|---------------------------------------------------------|
 | `replicas`                                | Number of nodes                               | `1`                                                     |
+| `podDisruptionBudget.minAvailable`        | Pod disruption minimum available              | `nil`                                                     |
+| `podDisruptionBudget.maxUnavailable`      | Pod disruption maximum unavailable            | `nil`                                                     |
 | `deploymentStrategy`                      | Deployment strategy                           | `{ "type": "RollingUpdate" }`                           |
 | `livenessProbe`                           | Liveness Probe settings                       | `{ "httpGet": { "path": "/api/health", "port": 3000 } "initialDelaySeconds": 60, "timeoutSeconds": 30, "failureThreshold": 10 }` |
 | `readinessProbe`                          | Readiness Probe settings                      | `{ "httpGet": { "path": "/api/health", "port": 3000 } }`|

stable/grafana/templates/poddisruptionbudget.yaml

@@ -0,0 +1,25 @@
+{{- if .Values.podDisruptionBudget }}
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ template "grafana.name" . }} 
+  labels:
+    app: {{ template "grafana.name" . }}
+    chart: {{ template "grafana.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+{{- if .Values.labels }}
+{{ toYaml .Values.labels | indent 4 }}
+{{- end }}
+spec:
+{{- if .Values.podDisruptionBudget.minAvailble }}
+  minAvailable: {{ .Values.podDisruptionBudget.minAvailble }}
+{{- end }}
+{{- if .Values.podDisruptionBudget.maxUnavailable }}
+  maxUnavailable: {{ .Values.podDisruptionBudget.maxUnavailable }}
+{{- end }}
+  selector:
+    matchLabels:
+      app: {{ template "grafana.name" . }}
+      release: {{ .Release.Name }}
+{{- end }}

stable/grafana/values.yaml

@@ -18,6 +18,12 @@ serviceAccount:
 
 replicas: 1
 
+## See `kubectl explain poddisruptionbudget.spec` for more
+## ref: https://kubernetes.io/docs/tasks/run-application/configure-pdb/
+podDisruptionBudget: {}
+#  minAvailble: 1
+#  maxUnavailable: 1
+
 ## See `kubectl explain deployment.spec.strategy` for more
 ## ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy
 deploymentStrategy: