Add support for pod disruption budget

stable/app/Chart.yaml

@@ -15,4 +15,4 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.5.4
+version: 0.5.5

stable/app/README.md

@@ -91,6 +91,9 @@ The following table lists the configurable parameters of the Siren chart and the
 | telegraf.containerPort                | int    | `8125`                                                                                        |                                                                      |
 | telegraf.protocol                     | string | `UDP`                                                                                         |                                                                      |
 | telegraf.config                       | string | `""`                                                                                          | telegraf config file content                                         |
+| pdb.enabled | bool | `false` | Whether to enable pod disruption budget on the release | 
+| pdb.minAvailable | int | `0` | minimum number of pods that should be available according to PDB |
+| pdb.maxUnavailable | int | `` | maximum number of pods that can be unavailable according to PDB |
 
 ---
 

stable/app/templates/pdb.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.pdb.enabled -}}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "app.fullname" . }}-pdb
+  labels:
+    {{- include "app.labels" . | nindent 4 }}
+spec:
+  {{- if .Values.pdb.maxUnavailable }}
+  maxUnavailable: {{ .Values.pdb.maxUnavailable }}
+  {{- end }}
+  minAvailable: {{ .Values.pdb.minAvailable | default 0 }}
+  selector:
+    matchLabels:
+      {{- include "app.selectorLabels" . | nindent 6 }}
+{{- end }}

stable/app/values.yaml

@@ -165,3 +165,8 @@ autoscaling:
   maxReplicas: 2
   targetMemory: 80
   targetCPU: 80
+
+pdb:
+  enabled: false
+  # minAvailable: 0
+  # maxUnavailable: 1