cookbooks/fb_syslog/templates/default/rsyslog-sysconf.erb

# This file is owned by Chef. See fb_syslog/README.md
<% node['fb_syslog']['sysconfig']['vars'].to_hash.each do |key, val| %>
<%=  key.upcase %>="<%= val %>"
<% end %>
<% node['fb_syslog']['sysconfig']['extra_lines'].each do |line| %>
<%=  line %>
<% end %>