A bare metal monitoring stack

For a while now, I had this growing feeling that something was wrong with my main server. This is where I host most of my public services: a mail server, a bunch of websites behind nginx, PostgreSQL and MariaDB, my git forge, and a few other things. These are all services that I use for myself, which wouldn&rsquo;t be a problem, but I&rsquo;ve also started selling some of them to friends, family,…