使用Prometheus的webhook receiver来记录Alertmanager发出的所有通知，并将记录的邮件地址通过指标（metric）的形式存储到Prometheus中。代码示例如下：

1.创建一个webhook receiver，并将邮件地址存储到Prometheus中：

receivers:
- name: email-receiver
  webhook_configs:
  - url: http://localhost:5001/email
  routes:
  - match:
      alertname: some-alert
    receiver: email-receiver

- job_name: 'prometheus'
  scrape_interval: 5s
  static_configs:
  - targets: ['localhost:9090']
    labels:
      env: "dev"

2.创建一个记录邮件地址的Exporter：

from flask import Flask, request
from prometheus_client import Counter, Gauge, pushadd_to_gateway, CollectorRegistry

app = Flask(__name__)

emails = Gauge('alertmanager_emails', 'Email addresses of Alertmanager notifications', ['receiver', 'to'])

@app.route('/email', methods=['POST'])
def record_email():
    data = request.json
    receiver = data['receiver']
    to = data['to']
    emails.labels(receiver=receiver, to=to).set(1)
    return '', 200

if __name__ == '__main__':
    app.run(port=5001)

3.查询存储在Prometheus中的邮件地址：

alertmanager_emails{receiver="email-receiver", to="example@example.com"} 1

注意：以上示例仅用于演示如何记录和存储Alertmanager发出的邮件地址，具体实现中需要考虑数据的安全性和存储方式等问题。