Put the schematic ID in a node annotation

[tjwallace]

Feature Request

Put the schematic ID in a node annotation

Description

It would be helpful for automations like system-upgrade-controller to have the Talos schematic ID in a node annotations (ie cluster.talos.dev/schematic-id) so it can be used to pull the correct installer image.

Currently my cluster needs two different schematic IDs so I cannot set a single value in my system-upgrade-controller plan.

Thanks!

[smira]

See #9070, if the extensions will be exposed via node labels, the schematic will be exposed as wll.

[tjwallace]

@smira one issue is the schematic id is too long for a node label (siderolabs/image-factory#126)

[smira]

yeah, true, I believe annotations have same limits (?). Certainly some extensions make more sense as labels (e.g. "I have nvidia"), while schematic is fine as an annotation (as it makes less sense to filter on it)

[tjwallace]

Annotations can be up to 256kb

[smira]

thanks @tjwallace, so it sounds like we'd need to split them across labels/annotations based on extension version length (as schematic virtual extension has schematic ID as a version).

That doesn't sound too bad for me.

[smira]

$ kubectl describe nodes talos-default-worker-1
Name:               talos-default-worker-1
Roles:              <none>
Labels:             beta.kubernetes.io/arch=amd64
                    extensions.talos.dev/spin=v0.13.1
				...