/usr/share/rsyslog-mysql/rsyslog-mysql.conf.template is in rsyslog-mysql 8.16.0-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | ### Configuration file for rsyslog-mysql
### Changes are preserved
$ModLoad ommysql
*.* :ommysql:_DBC_DBSERVER_,_DBC_DBNAME_,_DBC_DBUSER_,_DBC_DBPASS_
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