The feature that made 66 leave s6: the event system
With 0.9.0.0, 66 no longer links against skalibs, s6 or execline. The scanner, the supervisor, the logger, the fd holder and the privilege dropper are now native programs of the suite. Leaving the foundation a project was built on is not a decision to make lightly, so here is why. The tipping point was the event system: implementing it correctly is what made it clear that going further meant leaving s6. To see what it is for, start with a very ordinary problem that service managers usually solve with glue.