I'm such a plumber. I occasionally work on maintaining an ancient server environment running some custom code that can't run on modern OS's because <reason>. O

I'm such a plumber. I occasionally work on maintaining an ancient server environment running some custom code that can't run on modern OS's because <reason>. Over the years, more and more duct tape has been added, and there's little to no documentation of how everything is set up. The only remaining staff is me, who simply worked for a few years alongside the people who took over from the people who originally built everything. Nobody wants to pay to have some really dig into the system, documenting everything, and bringing it up to date, because there's a replacement system on the way (any year now). Instead, they call me every now and then to get everything rebooted. I don't mind the extra business, but if something really bad happens then that client is toast and there's not a soul who can fix it. Worst thing is I hear this kind of thing is frighteningly common.