[stable/prometheus-blackbox-exporter] Fix PodDisruptionBudget configuration (#19707)

* Fix PodDisruptionBudget configuration

Signed-off-by: Maxim Valiarovski <maxim.valiarovski@target.com>

* simplify -podDisruptionBudget configuration management

Signed-off-by: Maxim Valiarovski <maxim.valiarovski@target.com>

* Update readme

Signed-off-by: Maxim Valiarovski <maxim.valiarovski@target.com>

stable/prometheus-blackbox-exporter/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Prometheus Blackbox Exporter
 name: prometheus-blackbox-exporter
-version: 1.6.0
+version: 2.0.0
 appVersion: 0.15.1
 home: https://github.com/prometheus/blackbox_exporter
 sources:

stable/prometheus-blackbox-exporter/README.md

@@ -63,7 +63,7 @@ The following table lists the configurable parameters of the Blackbox-Exporter c
 | `tolerations`                          | node tolerations for pod assignment               | `[]`                          |
 | `affinity`                             | node affinity for pod assignment                  | `{}`                          |
 | `podAnnotations`                       | annotations to add to each pod                    | `{}`                          |
-| `podDisruptionBudget`                  | pod disruption budget                             | `{maxUnavailable: 0}`         |
+| `podDisruptionBudget`                  | pod disruption budget                             | `{}`         |
 | `priorityClassName`                    | priority class name                               | None                          |
 | `resources`                            | pod resource requests & limits                    | `{}`                          |
 | `restartPolicy`                        | container restart policy                          | `Always`                      |
@@ -99,6 +99,16 @@ $ helm install --name my-release -f values.yaml stable/prometheus-blackbox-expor
 
 ## Upgrading an existing Release to a new major version
 
+### 2.0.0
+
+This version removes the `podDisruptionBudget.enabled` parameter and changes the default value of `podDisruptionBudget` to `{}`, in order to fix Helm 3 compatibility.
+
+In order to upgrade, please remove `podDisruptionBudget.enabled` from your custom values.yaml file and set the content of `podDisruptionBudget`, for example:
+```yaml
+podDisruptionBudget:
+  maxUnavailable: 0
+```
+
 ### 1.0.0
 
 This version introduce the new recommended labels.

stable/prometheus-blackbox-exporter/templates/poddisruptionbudget.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.podDisruptionBudget.enabled -}}
+{{- if .Values.podDisruptionBudget -}}
 apiVersion: policy/v1beta1
 kind: PodDisruptionBudget
 metadata:

stable/prometheus-blackbox-exporter/values.yaml

@@ -1,8 +1,7 @@
 restartPolicy: Always
 
-podDisruptionBudget:
-  enabled: true
-  maxUnavailable: 0
+podDisruptionBudget: {}
+  # maxUnavailable: 0
 
 strategy:
   rollingUpdate: