[rsyslog] Add the syslog message format as specified in RFC 5424.

Signed-off-by: sh_wang <[email protected]>

Author: shihhsien-wang

files/image_config/rsyslog/rsyslog.conf.j2

@@ -56,6 +56,9 @@ $ActionFileDefaultTemplate SONiCFileFormat
 $template SONiCForwardFormat,"<%PRI%>%TIMESTAMP:::date-rfc3339% %HOSTNAME% %syslogseverity-text:::uppercase% %syslogtag%%msg:::sp-if-no-1st-sp%%msg:::drop-last-lf%\n"
 $ActionForwardDefaultTemplate SONiCForwardFormat
 
+# Define the syslog message format as specified in RFC 5424.
+$template SONiCFileFormat_RFC5424,"<%PRI%>1 %TIMESTAMP:::date-rfc3339% %HOSTNAME% %APP-NAME% %PROCID% %MSGID% %STRUCTURED-DATA% %msg%\n"
+
 template(name="WelfRemoteFormat" type="string" string="%TIMESTAMP% id=firewall time=\"%timereported\
 :::date-year%-%timereported:::date-month%-%timereported:::date-day% %timereported:::date-hour%:%timereported:::date-minute%:%timereported\
 :::date-second%\" fw=\"{{ fw_name }}\" pri=%syslogpriority% msg=\"%syslogtag%%msg:::sp-if-no-1st-sp%%msg:::drop-last-lf%\"\n")