New `grafanafolder#spec.uid` property for stable UIDs about grafana-operator

[Baarsgaard]

I have since found out, the same issue is present on GrafanaContactPoint and GrafanaNotificationPolicy which also does not allow specifying UIDs

[pb82]

Allowing custom UIDs on folders can become complicated (more complicated than other resources), because: if you change the UID on an already existing folder, what do you do with the original one and all the dashboards it contains? You'd have to write special logic to handle those cases (and agree on a policy).

[Baarsgaard]

Could that be handled/enforced through an immutability clause requiring a recreate rather than an edit of the Grafanafolder resource?
You already have that on the metadata.uid and instanceSelector.matchLabels in the CRDs I believe.

x-kubernetes-validations:
  - message: Value is immutable
    rule: self == oldSelf

That way, changing the UID is officially not supported, but it's possible to define an ID on creation?
This would also be compatible with #1626 which fixes blocking folder deletes when referenced without extra logic.

[theSuess]

@aboulay-numspot will try to implement this with immutable UIDs