Allow post-delete job to be disabled

There are situations where the modifications performed by the NFD need to be
preserved even after its removal.

One such use case arises when NFD is installed as part of another project. By
design, uninstalling the parent project does not remove all its components.
However, the remaining components still rely on the labels created by NFD. If
NFD is removed, these labels will be deleted, causing dependent components to
fail.

To maintain system integrity and ensure continued functionality, adding the
'postDeleteCleanup' option that allows any modifications made by NFD to be
preserved upon its removal.

Signed-off-by: Aleksey Senin <[email protected]>

Author: alekseysen

deployment/helm/node-feature-discovery/templates/post-delete-job.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.postDeleteCleanup }}
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@@ -96,3 +97,5 @@ spec:
       tolerations:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+{{- end }}
+

deployment/helm/node-feature-discovery/values.yaml

@@ -15,6 +15,8 @@ featureGates:
 
 priorityClassName: ""
 
+postDeleteCleanup: true
+
 master:
   enable: true
   extraArgs: []

docs/deployment/helm.md

@@ -164,6 +164,7 @@ Chart parameters are available.
 | `prometheus.labels`                                 | dict   | {}                                                  | Specifies labels for use with the prometheus operator to control how it is selected                                                                                                                                                                                                 |
 | `prometheus.scrapeInterval`                         | string | 10s                                                 | Specifies the interval by which metrics are scraped                                                                                                                                                                                                                                 |
 | `priorityClassName`                                 | string |                                                     | The name of the PriorityClass to be used for the NFD pods.                                                                                                                                                                                                                          |
+| `postDeleteCleanup`                                 | bool   | true                                                | Controls behavior of post-delete hook.                                                                                                                                                                                                                                              |
 
 Metrics are configured to be exposed using prometheus operator API's by
 default. If you want to expose metrics using the prometheus operator