# Functions
AddCallback registers a callback for execution before shutdown.
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WaitShutdown waits for application shutdown.
# Variables
ErrForceShutdown is returned when the user or operating system is sending SIGINT or SIGTERM for the application being is graceful-shutdown state.
ErrTimeoutExceeded is returned when the application fails shutdown for a given period of time.
# Type aliases
ShutdownFunc is a callback-type for registering callbacks before application shutdown.