I’m also hopeful fcast gets some more love. The ability to mirror my whole android screen to an fcast server would be great they have servers for Mac, Linux, Windows, and Android but not a lot of clients.
Grayjay integration works well I use it instead of casting.
Munin is a tried and true solution. It installs on the server creates graphs and makes it easy to see a stair step graph to problems like out of memory.
I’d also highly recommend installing atop and having it collect stats every 1 to 2 minutes. You can go to a crashed server and step through what was running in a “top” like interfsce. I install atop on any server as a means for post incident diagnosis.