Why the messages show "\n" ?

I used Syslog Kafka for conllecting message, but the messages show “\n” not LF(Line Feed) in graylog as shown below. i hope show message in graylog as log in server,how can i set it?
[graylog]


[log in server]

you did not reveal how you have ingested the messages.

I set rsyslog to kafka, and the configration of grayllog-inputs and the template of rsyslog config file as shown below.


Did I spot a \n at the end of the template?

I try many time, that is not the reason.
When I collect multiple lines of messages, the end of each line is automatically added “/n” in graylog.

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