monitorix_ynh/conf/nginx.conf

location __PATH__ {
    proxy_pass		http://127.0.0.1:__PORT____PATH__;
    allow		127.0.0.0/8;

    location ~ ^__PATH__/(.+\.png)$ {
        alias /var/lib/monitorix/www/$1;
    }
    
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;

    proxy_connect_timeout       600;
    proxy_send_timeout          600;
    proxy_read_timeout          600;
    send_timeout                600;
    
    # Include SSOWAT user panel.
    include conf.d/yunohost_panel.conf.inc;
}