echo "Alternatively, if you choose to allow an etcd upgrade that doesn't support downgrade,"
    echo "you might still be able to downgrade Kubernetes by pinning to the newer etcd version."
    echo "In all cases, it is strongly recommended to have an etcd backup before upgrading."
    echo
    if [ -t 0 ] && [ -t 1 ]; then
      read -r -p "Continue with default etcd version, which might upgrade etcd? [y/N] " confirm

	var tests = []struct {
		name           string
		etcd           *kubeadmapi.Etcd
		expectedErrors bool
	}{
		{
			name:           "either .Etcd.Local or .Etcd.External is required",
			etcd:           &kubeadmapi.Etcd{},
			expectedErrors: true,
		},
		{
			name: ".Etcd.Local and .Etcd.External are mutually exclusive",
			etcd: &kubeadmapi.Etcd{
				Local: &kubeadmapi.LocalEtcd{

See the License for the specific language governing permissions and
limitations under the License.
*/

package etcd3

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"path"
	"reflect"
	"strings"
	"time"

	clientv3 "go.etcd.io/etcd/client/v3"
	"go.opentelemetry.io/otel/attribute"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/meta"

# are pre-installed in the image. Note that currently this logic
# is only supported in trusty or GCI.
TEST_CLUSTER=${TEST_CLUSTER:-true}

# Storage backend. 'etcd2' and 'etcd3' are supported.
STORAGE_BACKEND=${STORAGE_BACKEND:-}
# Storage media type: application/json and application/vnd.kubernetes.protobuf are supported.
STORAGE_MEDIA_TYPE=${STORAGE_MEDIA_TYPE:-}

# Optional: if set to true kube-up will automatically check for existing resources and clean them up.
KUBE_UP_AUTOMATIC_CLEANUP=${KUBE_UP_AUTOMATIC_CLEANUP:-false}

# Storage backend. 'etcd2' supported, 'etcd3' experimental.
STORAGE_BACKEND=${STORAGE_BACKEND:-}

# Networking plugin specific settings.
NETWORK_PROVIDER="${NETWORK_PROVIDER:-kubenet}" # none, kubenet

# Network Policy plugin specific settings.

	"log"
	"math/rand"
	"net"
	"net/url"
	"os"
	"path"
	"strings"
	"sync"
	"time"

	grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus"
	"go.etcd.io/etcd/client/pkg/v3/logutil"
	"go.etcd.io/etcd/client/pkg/v3/transport"
	clientv3 "go.etcd.io/etcd/client/v3"
	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"golang.org/x/time/rate"

		"SSL key file used to secure etcd communication.")

	fs.StringVar(&s.StorageConfig.Transport.CertFile, "etcd-certfile", s.StorageConfig.Transport.CertFile,
		"SSL certification file used to secure etcd communication.")

	fs.StringVar(&s.StorageConfig.Transport.TrustedCAFile, "etcd-cafile", s.StorageConfig.Transport.TrustedCAFile,
		"SSL Certificate Authority file used to secure etcd communication.")

limitations under the License.
*/

package etcd

import (
	"context"
	"crypto/tls"
	"fmt"
	"net"
	"net/url"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/pkg/errors"
	"go.etcd.io/etcd/api/v3/etcdserverpb"
	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
	"go.etcd.io/etcd/client/pkg/v3/transport"
	clientv3 "go.etcd.io/etcd/client/v3"
	"google.golang.org/grpc"

	fs.StringVar(&etcdVersionScrapeURI, "etcd-version-scrape-uri", "http://localhost:2379/version", "URI to scrape etcd version info")
	fs.StringVar(&etcdMetricsScrapeURI, "etcd-metrics-scrape-uri", "http://localhost:2379/metrics", "URI to scrape etcd metrics")
	fs.DurationVar(&scrapeTimeout, "scrape-timeout", 15*time.Second, "Timeout for trying to get stats from etcd")
}

const (
	namespace = "etcd" // For prefixing prometheus metrics
)

		skipHealth        bool
	}{
		{
			name:              "Readyz should have etcd-readiness check",
			wantReadyzChecks:  []string{"etcd", "etcd-readiness"},
			wantHealthzChecks: []string{"etcd"},
			wantLivezChecks:   []string{"etcd"},
		},
		{
			name:              "skip health, Readyz should not have etcd-readiness check",
			wantReadyzChecks:  nil,
			wantHealthzChecks: nil,
			wantLivezChecks:   nil,