The last release of Upstart was July 2014 [1], and there have been no new commits to the repo. We should move on too. [1] https://lists.ubuntu.com/archives/upstart-devel/2014-July/003313.html The only real support was in the code that looked for $PREVLEVEL. https://codesearch.debian.net/search?q=PREVLEVEL&literal=1&perpkg=1 shows this string in our own code (or the copy in elogind), our own man pages, and init scripts for two packages (brltty, salt), which shouldn't be used with systemd. (And both *check* for PREVLEVEL, and don't set it. So most likely nothing at all sets it.)
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