Alerts to rocketchat are not parsed

[Yukesh4791]

I'm trying to integrate RocketChat for Alertmanager's notification and using the provided AlertmanagerIntegrations.js to parse the alerts. Whereas the messages are not parsed as expected. As we can see in the attached image, the alert message doesn't contain proper information on instance, description and summary. Am I missing out something here in order to receive proper alerts.

@pavel-kazhavets