Hi, very useful. I am looking for some alternatives I could use with Kubernetes in an automated way, but haven't had much success so far. Perhaps I could have the app create an ingress whenever a user adds a custom domain, and let cert-manager handle the certificate for me, but I am not sure yet if this is the best approach with Kubernetes. Anyway, what I wanted to ask you is if you have run into any limits not just with LetsEncrypt, but with the OpenResty solution. How many certificates can be handled with the Lua thing and by OpenResty/Nginx itself? Would this scale to thousands or 100s of thousands users if the app is successful? If scalability is not a huge issue with this solution I might try to adapt it to Kubernetes by using SSL passthrough from ingress controller to a customised instance of OpenResty. Thanks in advance!