How to receive the notification with the source info

Hi All

I’m newbie for Graylog configuration.
I’m trying to set E-mail alert using Graylog.
I’ve set the stream, alert, notification and I also got the e-mail notification when it hit the condition.
But I can not see the which source has the issue.
The below E-mail body configuration is default setting.
How can I adjust the below contents to see which host or ip address has an issue ?
Both “Message: {message.message}" and "Source: {message.source}” are not working.

##########
Alert Description: {check_result.resultDescription} Date: {check_result.triggeredAt}
Stream ID: {stream.id} Stream title: {stream.title}
Stream description: {stream.description} Alert Condition Title: {alertCondition.title}
{if stream_url}Stream URL: {stream_url}${end}

Triggered condition: ${check_result.triggeredCondition}
##########

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