This is impressive! Very well done @liam. I definitely have to check it out.
Pretty sure you have it on your list of ideas already - I think it would be great to have additionally to the mail notifications an overview of passed/failed tests within the UI, which would allow to quickly jump to the affected nodes.
Yes, sounds great. So I believe this dropdown would contain a list including specific error messages and the user could maybe even click on them to jump to the affected node.
Yes something like that. Also, something on the node would be cool to have showing that it has failed the last time it ran
Those two things are not really a priority for me right now though. I will be focusing on just getting it production ready so that I can start using it