Introduce WorkloadKubernetesVersion field to ClusterctlUpgradeSpecInput

(cherry picked from commit 077d303)

.github/ISSUE_TEMPLATE/kubernetes_bump.md

@@ -28,7 +28,7 @@ changes should be cherry-picked to all release series that will support the new
   * Ensure the latest available kind version is used (including the latest images for this kind release)
   * Verify the quickstart manually
   * Prior art: #7156
-  * bump `InitWithKubernetesVersion` in `clusterctl_upgrade_test.go`
+  * bump `InitWithKubernetesVersion` and `WorkloadKubernetesVersion` in `clusterctl_upgrade_test.go`
 * [ ] Ensure the jobs are adjusted to provide test coverage according to our [support policy](https://cluster-api.sigs.k8s.io/reference/versions.html#supported-kubernetes-versions):
   * For the main branch and the release branch of the latest supported Cluster API minor release:
     * Add new periodic upgrade job.

docs/book/src/developer/providers/v1.3-to-v1.4.md

@@ -75,7 +75,7 @@ maintainers of providers and consumers of our Go API.
   For more information, please see: https://github.com/kubernetes/enhancements/issues/2845
 - A new `KCPRemediationSpec` test has been added providing better test coverage for KCP remediation most common use cases. As a consequence `MachineRemediationSpec` has been renamed to `MachineDeploymentRemediationSpec` and now only tests remediation of worker machines (NOTE: we plan to improve this test as well in a future iteration).
 - Package `test/infrastructure/docker/internal/third_party/forked/loadbalancer` has been moved to `test/infrastructure/docker/internal/loadbalancer` to allow it to diverge from the upstream Kind package.
-- 
+
 ### Suggested changes for providers
 
 - Providers should add an explicit security context to their controllers deployment, see [#7831](https://github.com/kubernetes-sigs/cluster-api/pull/7831) for reference.

docs/release/release-tasks.md

@@ -110,7 +110,7 @@ This comes down to changing occurrences of the old version to the new version, e
          we use in the clusterctl upgrade tests (as of today `cluster-template` and `cluster-template-topology`).
       2. Remove old folders that are not used anymore (for `v1.4` we don't have to remove any).
    5. Modify the test specs in `test/e2e/clusterctl_upgrade_test.go` (according to the versions we want to test described above).
-      Please note that `InitWithKubernetesVersion` should be the highest mgmt cluster version supported by the respective Cluster API version.
+      Please note that both `InitWithKubernetesVersion` and `WorkloadKubernetesVersion` should be the highest mgmt cluster version supported by the respective Cluster API version.
 2. Update `create-local-repository.py` and `tools/tilt-prepare/main.go`: `v1.3.99` => `v1.4.99`.
 3. Update `.github/workflows/scan.yml` - to setup Trivy scanning - and `.github/workflows/lint-docs-weekly.yml` - to setup link checking in the CAPI book - for the currently supported branches.
 4. Make sure all tests are green (also run `pull-cluster-api-e2e-full-main` and `pull-cluster-api-e2e-workload-upgrade-1-23-latest-main`).

test/e2e/clusterctl_upgrade.go

@@ -105,6 +105,8 @@ type ClusterctlUpgradeSpecInput struct {
 	MgmtFlavor                  string
 	CNIManifestPath             string
 	WorkloadFlavor              string
+	// WorkloadKubernetesVersion is Kubernetes version used to create the workload cluster, e.g. `v1.25.0`
+	WorkloadKubernetesVersion string
 	// Custom providers can be specified to upgrade to a pre-release or a custom version instead of upgrading to the latest using contact
 	CoreProvider              string
 	BootstrapProviders        []string
@@ -328,7 +330,10 @@ func ClusterctlUpgradeSpec(ctx context.Context, inputGetter func() ClusterctlUpg
 		// so we are getting a template using the downloaded version of clusterctl, applying it, and wait for machines to be provisioned.
 
 		workLoadClusterName = fmt.Sprintf("%s-%s", specName, util.RandomString(6))
-		kubernetesVersion := input.E2EConfig.GetVariable(KubernetesVersion)
+		kubernetesVersion := input.WorkloadKubernetesVersion
+		if kubernetesVersion == "" {
+			kubernetesVersion = input.E2EConfig.GetVariable(KubernetesVersion)
+		}
 		controlPlaneMachineCount := pointer.Int64(1)
 		workerMachineCount := pointer.Int64(1)
 

test/e2e/clusterctl_upgrade_test.go

@@ -36,7 +36,8 @@ var _ = Describe("When testing clusterctl upgrades (v0.3=>current)", func() {
 			InitWithBinary:            "https://github.com/kubernetes-sigs/cluster-api/releases/download/v0.3.25/clusterctl-{OS}-{ARCH}",
 			InitWithProvidersContract: "v1alpha3",
 			// CAPI v0.3.x does not work on Kubernetes >= v1.22.
-			InitWithKubernetesVersion: "v1.21.12",
+			InitWithKubernetesVersion: "v1.21.14",
+			WorkloadKubernetesVersion: "v1.22.17",
 			// CAPI does not work with Kubernetes < v1.22 if ClusterClass is enabled, so we have to disable it.
 			UpgradeClusterctlVariables: map[string]string{
 				"CLUSTER_TOPOLOGY": "false",
@@ -68,7 +69,8 @@ var _ = Describe("When testing clusterctl upgrades (v0.4=>current)", func() {
 			SkipCleanup:               skipCleanup,
 			InitWithBinary:            "https://github.com/kubernetes-sigs/cluster-api/releases/download/v0.4.8/clusterctl-{OS}-{ARCH}",
 			InitWithProvidersContract: "v1alpha4",
-			InitWithKubernetesVersion: "v1.23.13",
+			InitWithKubernetesVersion: "v1.23.17",
+			WorkloadKubernetesVersion: "v1.23.17",
 			MgmtFlavor:                "topology",
 			WorkloadFlavor:            "",
 			// This check ensures that ownerReference apiVersions are updated for all types after the upgrade.
@@ -105,7 +107,8 @@ var _ = Describe("When testing clusterctl upgrades (v1.0=>current)", func() {
 			// runtime extension providers. If we don't do this the test will automatically
 			// try to deploy the latest version of our test-extension from docker.yaml.
 			InitWithRuntimeExtensionProviders: []string{},
-			InitWithKubernetesVersion:         "v1.23.13",
+			InitWithKubernetesVersion:         "v1.23.17",
+			WorkloadKubernetesVersion:         "v1.23.17",
 			MgmtFlavor:                        "topology",
 			WorkloadFlavor:                    "",
 			// This check ensures that ownerReference apiVersions are updated for all types after the upgrade.
@@ -211,7 +214,8 @@ var _ = Describe("When testing clusterctl upgrades (v1.3=>current)", func() {
 			SkipCleanup:               skipCleanup,
 			InitWithBinary:            "https://github.com/kubernetes-sigs/cluster-api/releases/download/v1.3.5/clusterctl-{OS}-{ARCH}",
 			InitWithProvidersContract: "v1beta1",
-			InitWithKubernetesVersion: "v1.27.0",
+			InitWithKubernetesVersion: "v1.26.3",
+			WorkloadKubernetesVersion: "v1.26.3",
 			MgmtFlavor:                "topology",
 			WorkloadFlavor:            "",
 			// This check ensures that ownerReference apiVersions are updated for all types after the upgrade.
@@ -239,7 +243,8 @@ var _ = Describe("When testing clusterctl upgrades using ClusterClass (v1.3=>cur
 			SkipCleanup:               skipCleanup,
 			InitWithBinary:            "https://github.com/kubernetes-sigs/cluster-api/releases/download/v1.3.5/clusterctl-{OS}-{ARCH}",
 			InitWithProvidersContract: "v1beta1",
-			InitWithKubernetesVersion: "v1.27.0",
+			InitWithKubernetesVersion: "v1.26.3",
+			WorkloadKubernetesVersion: "v1.26.3",
 			MgmtFlavor:                "topology",
 			WorkloadFlavor:            "topology",
 			// This check ensures that ownerReference apiVersions are updated for all types after the upgrade.