CLI args support for overriding config values.
Contains API to obtain garbage collector stats.
Registry of open files, plus methods to reopen one or all.
PID file that prevents multiple instances of an app opening in the same dir.
Epoll-based signal handlers.
Support for scheduler config and running an app's main logic in a Task.
Support for app-level timers.
Support for unix socket command handling.
App version and build information.