// This module is included in the following assemblies:
//
// assembly-upgrade-resources.adoc

[id='con-upgrade-custom-resources-{context}']

= API versioning

[role="_abstract"]
Custom resources are edited and controlled using APIs added to Kubernetes by CRDs.
Put another way, CRDs extend the Kubernetes API to allow the creation of custom resources.
CRDs are themselves resources within Kubernetes.
They are installed in a Kubernetes cluster to define the versions of API for the custom resource.
Each version of the custom resource API can define its own schema for that version.
Kubernetes clients, including the Strimzi Operators, access the custom resources served by the Kubernetes API server using a URL path (_API path_), which includes the API version.

The introduction of `{ApiVersion}` updates the schemas of the custom resources.
The `v1alpha1` and `v1beta1` versions have been removed.

The `v1alpha1` API version is no longer used for the following Strimzi custom resources:

* `Kafka`
* `KafkaConnect`
* `KafkaConnectS2I`
* `KafkaConnector`
* `KafkaMirrorMaker`
* `KafkaMirrorMaker2`
* `KafkaTopic`
* `KafkaUser`
* `KafkaBridge`
* `KafkaRebalance`

The `v1beta1` API version is no longer used for the following Strimzi custom resources:

* `Kafka`
* `KafkaConnect`
* `KafkaConnectS2I`
* `KafkaMirrorMaker`
* `KafkaTopic`
* `KafkaUser`

[role="_additional-resources"]
.Additional resources
* {K8sCRDs}
