Using webhook to send alert to Rocket chat leads to empty message in Rocket

Bug description

New alert channel is created to use webhook to send message to Rocket chat. When alert is firing in SigNoz, there comes only empty message to Rocket channel with no content. There are no errors or warnings on SigNoz alertmanager logs.

Expected behavior

I would expect the message to contain payload described in https://signoz.io/docs/userguide/alerts-management/#d-receive-alert-through-webhook

How to reproduce

1. Configure webhook in Rocket chat
2. Create a new alarm channel using the created webhook
3. Create an new alarm using the created channel
4. Trigger the alarm -> empty message in Rocket

Version information

• Signoz version: v0.15.0