Add possibility to backup resources in namespaces matching a label

[lorenzofelletti]

Describe the problem/challenge you have
On thing I need to do is to backup all resources in namespaces matching a certain label, e.g. all the namespaces having label backup: true, or something like that.

Describe the solution you'd like
New version of Schedule/Backup spec supporting this option. Something like:

apiVersion: velero.io/v2alpha1
kind: Backup
metadata:
  name: a
  namespace: velero
spec:
  namespaceSelector:
    matchLabels:
      backup: "true"

Changing the BackupSpec type to something like:

type BackupSpec struct {
    // ...
    NamespaceSelector *metav1.LabelSelector `json:"namespaceSelector,omitempty"`
    // ...
}

Anything else you would like to add:

Environment:

• Velero version (use v1.14.0):
• Kubernetes version (use v1.30.2):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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[kaovilai]

labelselectors already apply to namespaces per https://github.com/vmware-tanzu/velero/pull/7697/files#diff-df144b27929ce35583cc82e55817b7d2423acccec581ea0ea0b8544ed3132a89R118-R133

dupe of #7105

[kaovilai]

if the documentation are unclear please list the pages needing updating.

[lorenzofelletti]

So labelSelector will backup any resource in the namespace with backup: true, regardless if individual resources in that namespace have such label in turn? If that's the current labelSelector field then I didn't know it

[lorenzofelletti]

As per the docs here:

  # Individual objects must match this label selector to be included in the backup. Optional.
  labelSelector:

To be clear, that is not the behaviour I want to achieve. I'd like to set the label on the namespace object, and have all resources in that namespace backed up (regardless of individual objects labels)

[kaovilai]

dupe of #7492 requirements then. We're saying the said requirements are not met?

[lorenzofelletti]

Yes, it looks like it is. Closing this one.

Thank you for the quick reply