/usr/lib/firewalld/services
Edit: /usr/lib/firewalld/services/syslog-tls.xml (444B)
syslog-tls
Syslog is a client/server protocol: a logging application transmits a text message to the syslog receiver. The receiver is commonly called syslogd, syslog daemon or syslog server. Syslog-tls uses TLS encryption to protect the messages during transport.