Implement renewer as Azure Function to save money

[Ciantic]

If this only needs to be called e.g. once in 90 days it's wasteful to do this as an app service.

Instead figuring out how to do this same thing as a Azure Function would be beneficial.

[ohadschn]

I don't think it's that wasteful seeing as you already have a web app running, so you could just use the same web app for the renewal site:. I suppose you do have to use "always on" which may take up some memory but I don't think it's significant.

At any rate, for an equivalent Azure Function look here: http://wp.sjkp.dk/lets-encrypt-on-azure-web-apps-using-a-function-app-for-automated-renewal/.