Failed to sink events to slack

[ys270]

Failed to send event to WebHook sink,because of failed to send msg to sink, because the response code is 400, body is : missing_text_or_fallback_or_attachments

Not sure why this happens , can anyone help?

configMap data is like:

  data:
    content: '{
    "text": "test",
    "channel": "testing",
    "icon_emoji": ":k8s:",
    "username": "eventer",
  }'

[ringtail]

missing_text_or_fallback_or_attachments might be a new param required by slack.