Does anybody know if this was a performance regression, or if there are plans to restore AsyncLocalStorage as the default scope-manager? I'm a little hesitant to upgrade past the release that introduced this change, as we've been hit in the past by performance regressions when changes have been made to the tracer's scope-manager.

@schmod The new scope manager basically does the same thing that AsyncLocalStorage itself does under the hood, and simply removes any additional logic that we don't need, some of which resulted in an incompatibility with fibers which Meteor uses. Because of that, it would be extremely unlikely to be slower than AsyncLocalStorage since it's basically a subset of the same code.