Improve documentation on installation and alerts

[lyz-code]

Hi @pdf I've been working with your awesome exporter the whole day, and I've created some docs for myself on how to install and configure it. You can find them here. Feel free to copy-paste any part that you'd like to use.

I'm fine with you closing the issue once you read it, it was the easiest way to reach out

[dbsavage]

thx. this was helpful. Is root actually needed for this to work? i thought you might be able to run this as a user systemd service use --user....