Set up alertmanager to send alerts to Microsoft Teams in RHOCP 4

Issue

• 如何配置 alertmanager ，来向 Microsoft 团队发送报警？

• 配置 alertmanager 来向 Microsoft 团队发送报警后，在 alertmanager pod 日志中观察到 unexpected status code 400 ：

  2022-04-24T19:54:50.370661642Z level=error ts=2022-04-24T19:54:50.370Z caller=dispatch.go:309 component=dispatcher msg="Notify for alerts failed" num_alerts=3 err="Default/webhook[0]: notify retry canceled due to unrecoverable error after 1 attempts: unexpected status code 400: https://example.webhook.com/<content for webhook>"
  

• 使用 webhook ，将 alertmanager 配置为向 Microsoft 团队发送报警，且警报没有收到