Configures additional log format [`log_format`](http://nginx.org/en/docs/http/ngx_http_log_module.html#log_format). options.
nginx_default_release: ""
(For Debian/Ubuntu only) Allows you to set a different repository for the installation of Nginx. As an example, if you are running Debian's wheezy release, and want to get a newer version of Nginx, you can install the `wheezy-backports` repository and set that value here, and Ansible will use that as the `-t` option while installing Nginx.