enable metrics server for scale tests

Author: upodroid

tests/e2e/scenarios/scalability/pre-test.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Copyright 2026 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.
+
+# We need to install metrics-server in the cluster and schedule it on the control-plane
+helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server/
+helm upgrade --dry-run --debug --install metrics-server metrics-server/metrics-server \
+    -n kube-system --set "args={--kubelet-insecure-tls}" \
+    --set "tolerations[0].key=node-role.kubernetes.io/control-plane" \
+    --set "tolerations[0].operator=Exists" \
+    --set "tolerations[0].effect=NoSchedule" \
+    --set resources.requests.cpu=4 \
+    --set resources.requests.memory=8Gi

tests/e2e/scenarios/scalability/run-test.sh

@@ -19,6 +19,7 @@ set -x
 
 make test-e2e-install
 
+REPO_ROOT=$(git rev-parse --show-toplevel)
 if [[ -z "${K8S_VERSION:-}" ]]; then
   K8S_VERSION=https://storage.googleapis.com/k8s-release-dev/ci/latest.txt
 fi
@@ -143,6 +144,7 @@ KUBETEST2_ARGS+=("--cloud-provider=${CLOUD_PROVIDER}")
 KUBETEST2_ARGS+=("--cluster-name=${CLUSTER_NAME:-}")
 KUBETEST2_ARGS+=("--admin-access=${ADMIN_ACCESS:-}")
 KUBETEST2_ARGS+=("--env=KOPS_FEATURE_FLAGS=${KOPS_FEATURE_FLAGS}")
+KUBETEST2_ARGS+=("--pre-test-cmd=${REPO_ROOT}/tests/e2e/scenarios/scalability/pre-test.sh")
 if [[ "${JOB_TYPE}" == "presubmit" && "${REPO_OWNER}/${REPO_NAME}" == "kubernetes/kops" ]]; then
   KUBETEST2_ARGS+=("--build")
   KUBETEST2_ARGS+=("--kops-binary-path=${GOPATH}/src/k8s.io/kops/.build/dist/linux/$(go env GOARCH)/kops")
@@ -188,6 +190,7 @@ fi
 export PROMETHEUS_KUBE_PROXY_SELECTOR_KEY="k8s-app"
 export PROMETHEUS_SCRAPE_APISERVER_ONLY="true"
 export CL2_PROMETHEUS_TOLERATE_MASTER="true"
+export CL2_EXECSERVICE_TOLERATE_CONTROL_PLANE="true"
 export ETCD_PORT="4001" # we want cl2 to use this port for etcd instead of 2379
 if [[ "${CLOUD_PROVIDER}" == "aws" && "${SCALE_SCENARIO}" == "performance" ]]; then
   # CL2 uses KUBE_SSH_KEY_PATH path to ssh to instances for scraping metrics