Getting - {"code":400,"errors":null,"message":"no alerts in Prometheus notification payload","status":"error"} about prometheus-config HOT 5 CLOSED

@satterly alerta webhook is not working in alertmanager, its not posting the alerts to alerta tool. I'm trying to send a test notification but its fails with 400 error.
curl -XPOST https://alerta.example.org/api/webhooks/prometheus?api-key=lafdlsdjfiADFsdjadfds3343lajfdakk
{
"code": 400,
"errors": null,
"message": "no alerts in Prometheus notification payload",
"status": "error"
}

from prometheus-config.

You need to include the alertmanager log files otherwise I can't' help you.

from prometheus-config.

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from prometheus-config.

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from prometheus-config.

I I have the same problem，after adding "startsAt": "2019-10-20T13:50:21+08:00"

from prometheus-config.