Public Service Announcement for anyone relying on Jenkins for
continuous deployment - the milestone step plugin as of version 1.3.1
will not function correctly if you could have more than two builds
running at once - older builds could get deployed after newer builds.
A possible workaround is to add an initial milestone at the start
of the pipeline, which will then allow builds to be killed
early. (Builds are only killed early once they have passed their first
Going by the source history, I reckon this bug has been present
since the milestone-step plugin was created.