label selector matches all objects. A null label selector matches
                    no objects.
                  properties:
                    matchExpressions:
                      description: matchExpressions is a list of label selector requirements.
                        The requirements are ANDed.
                      items:
                        description: A label selector requirement is a selector that

  // matchExpressions is a list of label selector requirements. The requirements are ANDed.
  // +optional
  repeated LabelSelectorRequirement matchExpressions = 2;
}

// A label selector requirement is a selector that contains values, a key, and an operator that
// relates the key and values.
message LabelSelectorRequirement {
  // key is the label key that the selector applies to.
  // +patchMergeKey=key

			if err != nil {
				return err
			}

			matchingServices := make([]corev1.Service, 0, len(svcs.Items))
			for _, svc := range svcs.Items {
				if len(svc.Spec.Selector) > 0 {
					svcSelector := klabels.SelectorFromSet(svc.Spec.Selector)
					if svcSelector.Matches(podLabels) {
						matchingServices = append(matchingServices, svc)
					}
				}
			}
			// Validate Istio's "Service association" requirement

              "format": "time_series",
              "hide": false,
              "intervalFactor": 1,
              "legendFormat": "Rejected CDS Configs",
              "refId": "C"
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },