1) the line between toggle and reloadable config is always fuzzy, in part because you don’t know for sure if it’s a toggle until users give their feedback. About half a percent of toggles stick around in perpetuity as either preferences or emergency relief valves for the operations team. That seems small but when you are doing CD aggressively that’s happening to you once a month or every few weeks which makes it a constant companion.

2) you need a system to track and complain about old toggles. If they survive the end of the Epic that birthed them, they become immortal. And you can see variations on Knight Capital play out when they get toggled years after they were supposed to be static.