What things are useful to self hosters?

Hi,

I'm building a health / fitness app, as part of it I want to provide a community server which allows for self hosting.

It will be open source, it will likely be written in Golang (if that matters) and I will provide documentation and a docker image.

Is there anything from other self hosting projects that people have found useful?

It's a little way away, but I want to make sure as I'm building i'm encompassing self host must haves.

Thanks!