Function init 

pub fn init() -> u16

Initialise the vlogger with the default configuation. The target whitelist gets loaded from the environment variable RUST_VLOG. If it is not set, all targets are whitelisted.

Returns the port at which the server is made available.

Panics

This function will panic if the vlogger has already been set or the server could not be started. For a non panicking version see init_port.