}

        private List<String> prependWithColonIfNeeded(String[] selectors) {
            return Arrays.stream(selectors).map(this::prependWithColonIfNeeded).collect(toList());
        }

        private String prependWithColonIfNeeded(String selector) {
            return selector.indexOf(':') == -1 ? ":" + selector : selector;
        }
    }

  // budget.
  // A null selector selects no pods.
  // An empty selector ({}) also selects no pods, which differs from standard behavior of selecting all pods.
  // In policy/v1, an empty selector will select all pods in the namespace.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 2;

  // An eviction is allowed if at most "maxUnavailable" pods selected by

// GetFirstPod returns a pod matching the namespace and label selector
// and the number of all pods that match the label selector.
// This is forked from  polymorphichelpers.GetFirstPod to not watch and instead return an error if no pods are found
func GetFirstPod(client v1.CoreV1Interface, namespace string, selector string) (*corev1.Pod, error) {
	options := metav1.ListOptions{LabelSelector: selector}

  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 1;

  // An object that describes the pod that will be created.
  // The DaemonSet will create exactly one copy of this pod on every node
  // that matches the template's node selector (or on every node if no node
  // selector is specified).

  // on whether the namespace for that object matches the selector. If the
  // object itself is a namespace, the matching is performed on
  // object.metadata.labels. If the object is another cluster scoped resource,
  // it never skips the webhook.
  //
  // For example, to run the webhook on any objects whose namespace is not
  // associated with "runlevel" of "0" or "1";  you will set the selector as
  // follows:
  // "namespaceSelector": {

  /**
   * Invoked after proxy selection.
   *
   * Note that the list of proxies is never null, but it may be a list containing
   * only [Proxy.NO_PROXY]. This comes up in several situations:
   *
   * * If neither a proxy nor proxy selector is configured.
   * * If the proxy is configured explicitly as [Proxy.NO_PROXY].
   * * If the proxy selector returns only [Proxy.NO_PROXY].
   * * If the proxy selector returns an empty list or null.
   *

		},
		{
			k8sConfigs: []runtime.Object{
				&corev1.Service{
					ObjectMeta: metav1.ObjectMeta{
						Name:      "productpage",
						Namespace: "default",
					},
					Spec: corev1.ServiceSpec{
						Selector: map[string]string{
							"app": "productpage",
						},
						Ports: []corev1.ServicePort{
							{
								Name:       "http",
								Port:       9080,
								TargetPort: intstr.FromInt32(9080),
							},

		nsMatchedLabels := make([]string, 0)
		podMatchedLabels := make([]string, 0)
		extractMatchLabels := func(selector *metav1.LabelSelector) []string {
			if selector == nil {
				return nil
			}
			labels := make([]string, 0)
			for _, me := range selector.MatchExpressions {
				if me.Operator != metav1.LabelSelectorOpIn {
					continue
				}
				for _, v := range me.Values {

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: {{ include "gateway.name" . }}
  namespace: {{ .Release.Namespace }}
  labels:
    {{- include "gateway.labels" . | nindent 4}}
spec:
  selector:
    matchLabels:
  {{- include "gateway.selectorLabels" . | nindent 6 }}
  {{- with .Values.podDisruptionBudget }}
    {{- toYaml . | nindent 2 }}
  {{- end }}

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello
spec:
  replicas: 7
  selector:
    matchLabels:
      app: hello
      tier: backend
      track: stable
  template:
    metadata:
      labels:
        app: hello
        tier: backend
        track: stable
    spec:
      containers:
        - name: hello
          image: "fake.docker.io/google-samples/hello-go-gke:1.0"
          ports: