"metadata": {
            "ISTIO_PROXY_SHA": "ee85c5f28702f00621aed895915fca565796b9e4",
            "ISTIO_VERSION": "1.21.0-1226",
            "metadata": {
              "build.type": "RELEASE",
              "build.label": "dev",
              "revision.sha": "ee85c5f28702f00621aed895915fca565796b9e4",
              "revision.status": "Clean",
              "ssl.version": "BoringSSL"
            }
          }

                      items:
                        description: A label selector requirement is a selector that
                          contains values, a key, and an operator that relates the
                          key and values.
                        properties:
                          key:
                            description: key is the label key that the selector applies

  // +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
  // +patchStrategy=merge
  optional string key = 1;