以编程方式识别何时创建或终止了微服务的新实例？

from kubernetes import client, config, watch

# 加载Kubernetes配置
config.load_kube_config()

# 创建CoreV1Api实例
v1 = client.CoreV1Api()

# 监听指定命名空间中的Pod事件
w = watch.Watch()
for event in w.stream(v1.list_namespaced_pod, namespace="default"):
    pod = event['object']
    if event['type'] == 'ADDED':
        print(f"Pod {pod.metadata.name} created")
    elif event['type'] == 'DELETED':
        print(f"Pod {pod.metadata.name} deleted")

import requests
from requests.exceptions import ConnectionError

def watch_consul_service(service_name):
    url = f"http://localhost:8500/v1/catalog/service/{service_name}"
    last_index = None

    while True:
        try:
            params = {'index': last_index} if last_index else {}
            response = requests.get(url, params=params)
            response.raise_for_status()
            data = response.json()
            last_index = response.headers.get('X-Consul-Index')

            current_instances = {entry['ServiceID']: entry for entry in data}
            if last_index != previous_index:
                print("Service instances changed")
                # 处理实例变化逻辑
                previous_index = last_index
        except ConnectionError as e:
            print(f"Connection error: {e}")
            break

# 监听名为'my-service'的服务
watch_consul_service('my-service')