build:~ # halt
That's the last command anyone will ever type on the venerable "build.eclipse.org" server. Born in 2005, it was used as a general-purpose machine for running builds and jobs for our committers. Some folks ran ant from cron jobs, some ran Cruise Control, and in 2007, we installed Hudson - a single instance CI for any project that wanted to create a job and use it.
From there, we added worker nodes, but as usage increased, stability decreased.