Abort prints error trace and exits.

Fatal outputs a log message from the arguments, then exits.

Fatalf outputs a formatted log message from the arguments, then exits.

NewLogger returns a *Logger.

SetOutput configures the output writer for the logger.

Warn outputs a log message from the arguments.

Warnf outputs a formatted log message from the arguments.

Writer returns a new *external.Writer suitable for injection into 3rd-party logging packages.