🐛 (go/v4): e2e test: Removed Prometheus dependency

docs/book/src/cronjob-tutorial/testdata/project/Makefile

@@ -67,8 +67,7 @@ test: manifests generate fmt vet setup-envtest ## Run tests.
 
 # TODO(user): To use a different vendor for e2e tests, modify the setup under 'tests/e2e'.
 # The default setup assumes Kind is pre-installed and builds/loads the Manager Docker image locally.
-# Prometheus and CertManager are installed by default; skip with:
-# - PROMETHEUS_INSTALL_SKIP=true
+# CertManager is installed by default; skip with:
 # - CERT_MANAGER_INSTALL_SKIP=true
 .PHONY: test-e2e
 test-e2e: manifests generate fmt vet ## Run the e2e tests. Expected an isolated environment using Kind.

docs/book/src/cronjob-tutorial/testdata/project/test/e2e/e2e_suite_test.go

@@ -30,16 +30,14 @@ import (
 
 var (
 	// Optional Environment Variables:
-	// - PROMETHEUS_INSTALL_SKIP=true: Skips Prometheus Operator installation during test setup.
 	// - CERT_MANAGER_INSTALL_SKIP=true: Skips CertManager installation during test setup.
-	// These variables are useful if Prometheus or CertManager is already installed, avoiding
+	// These variables are useful if CertManager is already installed, avoiding
 	// re-installation and conflicts.
-	skipPrometheusInstall  = os.Getenv("PROMETHEUS_INSTALL_SKIP") == "true"
 	skipCertManagerInstall = os.Getenv("CERT_MANAGER_INSTALL_SKIP") == "true"
-	// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
-	isPrometheusOperatorAlreadyInstalled = false
 	// isCertManagerAlreadyInstalled will be set true when CertManager CRDs be found on the cluster
 	isCertManagerAlreadyInstalled = false
+	// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
+	isPrometheusOperatorAlreadyInstalled = false
 
 	// projectImage is the name of the image which will be build and loaded
 	// with the code source changes to be tested.
@@ -49,7 +47,7 @@ var (
 // TestE2E runs the end-to-end (e2e) test suite for the project. These tests execute in an isolated,
 // temporary environment to validate project changes with the the purposed to be used in CI jobs.
 // The default setup requires Kind, builds/loads the Manager Docker image locally, and installs
-// CertManager and Prometheus.
+// CertManager.
 func TestE2E(t *testing.T) {
 	RegisterFailHandler(Fail)
 	_, _ = fmt.Fprintf(GinkgoWriter, "Starting project integration test suite\n")
@@ -72,19 +70,21 @@ var _ = BeforeSuite(func() {
 	ExpectWithOffset(1, err).NotTo(HaveOccurred(), "Failed to load the manager(Operator) image into Kind")
 
 	// The tests-e2e are intended to run on a temporary cluster that is created and destroyed for testing.
-	// To prevent errors when tests run in environments with Prometheus or CertManager already installed,
-	// we check for their presence before execution.
-	// Setup Prometheus and CertManager before the suite if not skipped and if not already installed
-	if !skipPrometheusInstall {
-		By("checking if prometheus is installed already")
-		isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
-		if !isPrometheusOperatorAlreadyInstalled {
-			_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
-			Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
-		} else {
-			_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
-		}
+	// To prevent errors when tests run in environments with Prometheus already installed,
+	// we check for it's presence before execution.
+	// Setup Prometheus before the suite if not already installed
+	By("checking if prometheus is installed already")
+	isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
+	if !isPrometheusOperatorAlreadyInstalled {
+		_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
+		Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
+	} else {
+		_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
 	}
+
+	// To prevent errors when tests run in environments with CertManager already installed,
+	// we check for its presence before execution.
+	// Setup CertManager before the suite if not skipped and if not already installed
 	if !skipCertManagerInstall {
 		By("checking if cert manager is installed already")
 		isCertManagerAlreadyInstalled = utils.IsCertManagerCRDsInstalled()
@@ -98,11 +98,13 @@ var _ = BeforeSuite(func() {
 })
 
 var _ = AfterSuite(func() {
-	// Teardown Prometheus and CertManager after the suite if not skipped and if they were not already installed
-	if !skipPrometheusInstall && !isPrometheusOperatorAlreadyInstalled {
+	// Teardown Prometheus after the suite if it was not already installed
+	if !isPrometheusOperatorAlreadyInstalled {
 		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling Prometheus Operator...\n")
 		utils.UninstallPrometheusOperator()
 	}
+
+	// Teardown CertManager after the suite if not skipped and if it was not already installed
 	if !skipCertManagerInstall && !isCertManagerAlreadyInstalled {
 		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling CertManager...\n")
 		utils.UninstallCertManager()

docs/book/src/getting-started/testdata/project/Makefile

@@ -63,8 +63,7 @@ test: manifests generate fmt vet setup-envtest ## Run tests.
 
 # TODO(user): To use a different vendor for e2e tests, modify the setup under 'tests/e2e'.
 # The default setup assumes Kind is pre-installed and builds/loads the Manager Docker image locally.
-# Prometheus and CertManager are installed by default; skip with:
-# - PROMETHEUS_INSTALL_SKIP=true
+# CertManager is installed by default; skip with:
 # - CERT_MANAGER_INSTALL_SKIP=true
 .PHONY: test-e2e
 test-e2e: manifests generate fmt vet ## Run the e2e tests. Expected an isolated environment using Kind.

docs/book/src/getting-started/testdata/project/config/default/kustomization.yaml

@@ -24,7 +24,7 @@ resources:
 # [CERTMANAGER] To enable cert-manager, uncomment all sections with 'CERTMANAGER'. 'WEBHOOK' components are required.
 #- ../certmanager
 # [PROMETHEUS] To enable prometheus monitor, uncomment all sections with 'PROMETHEUS'.
-- ../prometheus
+#- ../prometheus
 # [METRICS] Expose the controller manager metrics service.
 - metrics_service.yaml
 # [NETWORK POLICY] Protect the /metrics endpoint and Webhook Server with NetworkPolicy.

docs/book/src/getting-started/testdata/project/dist/install.yaml

@@ -461,25 +461,3 @@ spec:
       serviceAccountName: project-controller-manager
       terminationGracePeriodSeconds: 10
       volumes: []
----
-apiVersion: monitoring.coreos.com/v1
-kind: ServiceMonitor
-metadata:
-  labels:
-    app.kubernetes.io/managed-by: kustomize
-    app.kubernetes.io/name: project
-    control-plane: controller-manager
-  name: project-controller-manager-metrics-monitor
-  namespace: project-system
-spec:
-  endpoints:
-  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
-    path: /metrics
-    port: https
-    scheme: https
-    tlsConfig:
-      insecureSkipVerify: true
-  selector:
-    matchLabels:
-      app.kubernetes.io/name: project
-      control-plane: controller-manager

docs/book/src/getting-started/testdata/project/test/e2e/e2e_suite_test.go

@@ -30,14 +30,10 @@ import (
 
 var (
 	// Optional Environment Variables:
-	// - PROMETHEUS_INSTALL_SKIP=true: Skips Prometheus Operator installation during test setup.
 	// - CERT_MANAGER_INSTALL_SKIP=true: Skips CertManager installation during test setup.
-	// These variables are useful if Prometheus or CertManager is already installed, avoiding
+	// These variables are useful if CertManager is already installed, avoiding
 	// re-installation and conflicts.
-	skipPrometheusInstall  = os.Getenv("PROMETHEUS_INSTALL_SKIP") == "true"
 	skipCertManagerInstall = os.Getenv("CERT_MANAGER_INSTALL_SKIP") == "true"
-	// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
-	isPrometheusOperatorAlreadyInstalled = false
 	// isCertManagerAlreadyInstalled will be set true when CertManager CRDs be found on the cluster
 	isCertManagerAlreadyInstalled = false
 
@@ -49,17 +45,14 @@ var (
 // TestE2E runs the end-to-end (e2e) test suite for the project. These tests execute in an isolated,
 // temporary environment to validate project changes with the the purposed to be used in CI jobs.
 // The default setup requires Kind, builds/loads the Manager Docker image locally, and installs
-// CertManager and Prometheus.
+// CertManager.
 func TestE2E(t *testing.T) {
 	RegisterFailHandler(Fail)
 	_, _ = fmt.Fprintf(GinkgoWriter, "Starting project integration test suite\n")
 	RunSpecs(t, "e2e suite")
 }
 
 var _ = BeforeSuite(func() {
-	By("Ensure that Prometheus is enabled")
-	_ = utils.UncommentCode("config/default/kustomization.yaml", "#- ../prometheus", "#")
-
 	By("building the manager(Operator) image")
 	cmd := exec.Command("make", "docker-build", fmt.Sprintf("IMG=%s", projectImage))
 	_, err := utils.Run(cmd)
@@ -72,19 +65,9 @@ var _ = BeforeSuite(func() {
 	ExpectWithOffset(1, err).NotTo(HaveOccurred(), "Failed to load the manager(Operator) image into Kind")
 
 	// The tests-e2e are intended to run on a temporary cluster that is created and destroyed for testing.
-	// To prevent errors when tests run in environments with Prometheus or CertManager already installed,
-	// we check for their presence before execution.
-	// Setup Prometheus and CertManager before the suite if not skipped and if not already installed
-	if !skipPrometheusInstall {
-		By("checking if prometheus is installed already")
-		isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
-		if !isPrometheusOperatorAlreadyInstalled {
-			_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
-			Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
-		} else {
-			_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
-		}
-	}
+	// To prevent errors when tests run in environments with CertManager already installed,
+	// we check for its presence before execution.
+	// Setup CertManager before the suite if not skipped and if not already installed
 	if !skipCertManagerInstall {
 		By("checking if cert manager is installed already")
 		isCertManagerAlreadyInstalled = utils.IsCertManagerCRDsInstalled()
@@ -98,11 +81,7 @@ var _ = BeforeSuite(func() {
 })
 
 var _ = AfterSuite(func() {
-	// Teardown Prometheus and CertManager after the suite if not skipped and if they were not already installed
-	if !skipPrometheusInstall && !isPrometheusOperatorAlreadyInstalled {
-		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling Prometheus Operator...\n")
-		utils.UninstallPrometheusOperator()
-	}
+	// Teardown CertManager after the suite if not skipped and if it was not already installed
 	if !skipCertManagerInstall && !isCertManagerAlreadyInstalled {
 		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling CertManager...\n")
 		utils.UninstallCertManager()

docs/book/src/getting-started/testdata/project/test/e2e/e2e_test.go

@@ -184,11 +184,6 @@ var _ = Describe("Manager", Ordered, func() {
 			_, err = utils.Run(cmd)
 			Expect(err).NotTo(HaveOccurred(), "Metrics service should exist")
 
-			By("validating that the ServiceMonitor for Prometheus is applied in the namespace")
-			cmd = exec.Command("kubectl", "get", "ServiceMonitor", "-n", namespace)
-			_, err = utils.Run(cmd)
-			Expect(err).NotTo(HaveOccurred(), "ServiceMonitor should exist")
-
 			By("getting the service account token")
 			token, err := serviceAccountToken()
 			Expect(err).NotTo(HaveOccurred())

docs/book/src/multiversion-tutorial/testdata/project/Makefile

@@ -67,8 +67,7 @@ test: manifests generate fmt vet setup-envtest ## Run tests.
 
 # TODO(user): To use a different vendor for e2e tests, modify the setup under 'tests/e2e'.
 # The default setup assumes Kind is pre-installed and builds/loads the Manager Docker image locally.
-# Prometheus and CertManager are installed by default; skip with:
-# - PROMETHEUS_INSTALL_SKIP=true
+# CertManager is installed by default; skip with:
 # - CERT_MANAGER_INSTALL_SKIP=true
 .PHONY: test-e2e
 test-e2e: manifests generate fmt vet ## Run the e2e tests. Expected an isolated environment using Kind.

docs/book/src/multiversion-tutorial/testdata/project/test/e2e/e2e_suite_test.go

@@ -30,16 +30,14 @@ import (
 
 var (
 	// Optional Environment Variables:
-	// - PROMETHEUS_INSTALL_SKIP=true: Skips Prometheus Operator installation during test setup.
 	// - CERT_MANAGER_INSTALL_SKIP=true: Skips CertManager installation during test setup.
-	// These variables are useful if Prometheus or CertManager is already installed, avoiding
+	// These variables are useful if CertManager is already installed, avoiding
 	// re-installation and conflicts.
-	skipPrometheusInstall  = os.Getenv("PROMETHEUS_INSTALL_SKIP") == "true"
 	skipCertManagerInstall = os.Getenv("CERT_MANAGER_INSTALL_SKIP") == "true"
-	// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
-	isPrometheusOperatorAlreadyInstalled = false
 	// isCertManagerAlreadyInstalled will be set true when CertManager CRDs be found on the cluster
 	isCertManagerAlreadyInstalled = false
+	// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
+	isPrometheusOperatorAlreadyInstalled = false
 
 	// projectImage is the name of the image which will be build and loaded
 	// with the code source changes to be tested.
@@ -49,7 +47,7 @@ var (
 // TestE2E runs the end-to-end (e2e) test suite for the project. These tests execute in an isolated,
 // temporary environment to validate project changes with the the purposed to be used in CI jobs.
 // The default setup requires Kind, builds/loads the Manager Docker image locally, and installs
-// CertManager and Prometheus.
+// CertManager.
 func TestE2E(t *testing.T) {
 	RegisterFailHandler(Fail)
 	_, _ = fmt.Fprintf(GinkgoWriter, "Starting project integration test suite\n")
@@ -72,19 +70,21 @@ var _ = BeforeSuite(func() {
 	ExpectWithOffset(1, err).NotTo(HaveOccurred(), "Failed to load the manager(Operator) image into Kind")
 
 	// The tests-e2e are intended to run on a temporary cluster that is created and destroyed for testing.
-	// To prevent errors when tests run in environments with Prometheus or CertManager already installed,
-	// we check for their presence before execution.
-	// Setup Prometheus and CertManager before the suite if not skipped and if not already installed
-	if !skipPrometheusInstall {
-		By("checking if prometheus is installed already")
-		isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
-		if !isPrometheusOperatorAlreadyInstalled {
-			_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
-			Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
-		} else {
-			_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
-		}
+	// To prevent errors when tests run in environments with Prometheus already installed,
+	// we check for it's presence before execution.
+	// Setup Prometheus before the suite if not already installed
+	By("checking if prometheus is installed already")
+	isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
+	if !isPrometheusOperatorAlreadyInstalled {
+		_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
+		Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
+	} else {
+		_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
 	}
+
+	// To prevent errors when tests run in environments with CertManager already installed,
+	// we check for its presence before execution.
+	// Setup CertManager before the suite if not skipped and if not already installed
 	if !skipCertManagerInstall {
 		By("checking if cert manager is installed already")
 		isCertManagerAlreadyInstalled = utils.IsCertManagerCRDsInstalled()
@@ -98,11 +98,13 @@ var _ = BeforeSuite(func() {
 })
 
 var _ = AfterSuite(func() {
-	// Teardown Prometheus and CertManager after the suite if not skipped and if they were not already installed
-	if !skipPrometheusInstall && !isPrometheusOperatorAlreadyInstalled {
+	// Teardown Prometheus after the suite if it was not already installed
+	if !isPrometheusOperatorAlreadyInstalled {
 		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling Prometheus Operator...\n")
 		utils.UninstallPrometheusOperator()
 	}
+
+	// Teardown CertManager after the suite if not skipped and if it was not already installed
 	if !skipCertManagerInstall && !isCertManagerAlreadyInstalled {
 		_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling CertManager...\n")
 		utils.UninstallCertManager()

hack/docs/internal/cronjob-tutorial/e2e_implementation.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cronjob
+
+const isPrometheusInstalledVar = `
+// isPrometheusOperatorAlreadyInstalled will be set true when prometheus CRDs be found on the cluster
+isPrometheusOperatorAlreadyInstalled = false
+`
+
+const beforeSuitePrometheus = `
+By("Ensure that Prometheus is enabled")
+	_ = utils.UncommentCode("config/default/kustomization.yaml", "#- ../prometheus", "#")
+`
+
+const afterSuitePrometheus = `
+// Teardown Prometheus after the suite if it was not already installed
+if !isPrometheusOperatorAlreadyInstalled {
+	_, _ = fmt.Fprintf(GinkgoWriter, "Uninstalling Prometheus Operator...\n")
+	utils.UninstallPrometheusOperator()
+}
+`
+
+const checkPrometheusInstalled = `
+// To prevent errors when tests run in environments with Prometheus already installed,
+// we check for it's presence before execution.
+// Setup Prometheus before the suite if not already installed
+By("checking if prometheus is installed already")
+isPrometheusOperatorAlreadyInstalled = utils.IsPrometheusCRDsInstalled()
+if !isPrometheusOperatorAlreadyInstalled {
+	_, _ = fmt.Fprintf(GinkgoWriter, "Installing Prometheus Operator...\n")
+	Expect(utils.InstallPrometheusOperator()).To(Succeed(), "Failed to install Prometheus Operator")
+} else {
+	_, _ = fmt.Fprintf(GinkgoWriter, "WARNING: Prometheus Operator is already installed. Skipping installation...\n")
+}
+`
+const serviceMonitorE2e = `
+
+By("validating that the ServiceMonitor for Prometheus is applied in the namespace")
+	cmd = exec.Command("kubectl", "get", "ServiceMonitor", "-n", namespace)
+	_, err = utils.Run(cmd)
+	Expect(err).NotTo(HaveOccurred(), "ServiceMonitor should exist")
+
+`

hack/docs/internal/cronjob-tutorial/generate_cronjob.go

@@ -124,6 +124,8 @@ func (sp *Sample) UpdateTutorial() {
 	sp.updateExample()
 	// 12. add test
 	sp.addControllerTest()
+	// 13. update e2e tests
+	sp.updateE2E()
 }
 
 // CodeGen is a noop for this sample, just to make generation of all samples
@@ -646,3 +648,26 @@ func (sp *Sample) addControllerTest() {
 	err := afero.WriteFile(fs, filepath.Join(sp.ctx.Dir, "internal/controller/cronjob_controller_test.go"), []byte(controllerTest), 0600)
 	hackutils.CheckError("adding cronjob_controller_test", err)
 }
+
+func (sp *Sample) updateE2E() {
+	cronjobE2ESuite := filepath.Join(sp.ctx.Dir, "test", "e2e", "e2e_suite_test.go")
+	cronjobE2ETest := filepath.Join(sp.ctx.Dir, "test", "e2e", "e2e_test.go")
+	var err error
+
+	err = pluginutil.InsertCode(cronjobE2ESuite, `isCertManagerAlreadyInstalled = false`, isPrometheusInstalledVar)
+	hackutils.CheckError("fixing test/e2e/e2e_suite_test.go", err)
+
+	err = pluginutil.InsertCode(cronjobE2ESuite, `var _ = BeforeSuite(func() {`, beforeSuitePrometheus)
+	hackutils.CheckError("fixing test/e2e/e2e_suite_test.go", err)
+
+	err = pluginutil.InsertCode(cronjobE2ESuite,
+		`// The tests-e2e are intended to run on a temporary cluster that is created and destroyed for testing.`,
+		checkPrometheusInstalled)
+	hackutils.CheckError("fixing test/e2e/e2e_suite_test.go", err)
+
+	err = pluginutil.InsertCode(cronjobE2ESuite, `var _ = AfterSuite(func() {`, afterSuitePrometheus)
+	hackutils.CheckError("fixing test/e2e/e2e_suite_test.go", err)
+
+	err = pluginutil.InsertCode(cronjobE2ETest, `Expect(err).NotTo(HaveOccurred(), "Metrics service should exist")`, serviceMonitorE2e)
+	hackutils.CheckError("fixing test/e2e/e2e_test.go", err)
+}