Kubernetes Go-Client를 사용하여 포드에 효율적으로 레이블을 지정하는 방법은 무엇입니까?

<code class="go">import (
    "encoding/json"
    "time"

    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/apimachinery/pkg/types"
)

type patchStringValue struct {
    Op    string `json:"op"`
    Path  string `json:"path"`
    Value string `json:"value"`
}

// List and label Pods without "sent_alert_emailed" label
func labelPods(clientset kubernetes.Interface) error {
    pods, err := clientset.CoreV1().Pods("").List(metav1.ListOptions{LabelSelector: "!sent_alert_emailed"})
    if err != nil {
        return err
    }

    for _, pod := range pods.Items {
        payload := []patchStringValue{{
            Op:    "replace",
            Path:  "/metadata/labels/sent_alert_emailed",
            Value: time.Now().Format("2006-01-02_15.04.05"),
        }}
        payloadBytes, err := json.Marshal(payload)
        if err != nil {
            return err
        }

        _, err = clientset.CoreV1().Pods(pod.Namespace).Patch(pod.Name, types.JSONPatchType, payloadBytes)
        if err != nil {
            return err
        }
        fmt.Println(fmt.Sprintf("Pod %s labeled successfully.", pod.Name))
    }
    return nil
}</code>