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

Issue

• How to configure alertmanager to send the alerts to Microsoft Teams?

• After configuring alertmanager to send the alerts to Microsoft Teams unexpected status code 400 is observed in the alertmanager pod logs:

  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>"
  

• It was configured alertmanager to send the alerts to Microsoft Teams using a webhook and the alerts are not received