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Documentation for KReference.Group feature #3713

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Documentation for KReference.Group feature
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31 changes: 30 additions & 1 deletion docs/eventing/experimental-features.md
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Expand Up @@ -51,4 +51,33 @@ data:

## Features list

<!-- TODO there are no experimental features at the moment -->
### `KReference.Group` field

**Flag name**: `kreference-group`

**Stage**: Alpha, disabled by default

**Tracking issue**: https://github.com/knative/eventing/issues/5086
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abrennan89 marked this conversation as resolved.

When using the `KReference` type to refer to another Knative resource, you can just specify the API `group` of the resource, instead of the full `APIVersion`.

For example, in order to refer to an `InMemoryChannel`, instead of the following spec:

```yaml
apiVersion: messaging.knative.dev/v1
kind: InMemoryChannel
name: my-channel
```

You can use the following:

```yaml
group: messaging.knative.dev
kind: InMemoryChannel
name: my-channel
```

With this feature you can allow Knative to resolve the full `APIVersion` and further upgrades, deprecations and removals of the referred CRD without affecting existing resources.

!!! note
At the moment this feature is implemented only for `Subscription.Spec.Subscriber.Ref`.