*_by_lua_block directives break Letsencrypt's certbot

This is more of an issue for certbot than for this project but maybe there are some mitigating actions that you could do.

Any directive which includes a lua block like this one breaks certbot's parser and makes the automatic certificate renewal process fail.

        location = /ip-address {
                default_type text/plain;
                content_by_lua_block {
                        ngx.say(ngx.var.remote_addr)
                }
        }

There are at least a couple of issues for that on certbot's tracker with he details of what's going on

• https://github.com/certbot/certbot/issues/5194
• https://github.com/certbot/certbot/issues/9066

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic

$ dpkg -l "*nginx*"
ii  nginx-common                1.14.0-0ubuntu1.9  all                small, powerful, scalable web/proxy server - common files
ii  nginx-extras                1.14.0-0ubuntu1.9  amd64              nginx web/proxy server (extended version)
ii  libnginx-mod-http-lua       1.14.0-0ubuntu1.9  amd64              Lua module for Nginx
...

Start with the content_by_lua_block directive shown in the issue and compare the linked Certbot reports to confirm the parser failure and its scope. Done would require identifying a concrete mitigation that this module can support or documenting that the failure must be addressed by Certbot.