Debug logs a debug message.

Debugf logs a formatted debug message.

Error logs an error message.

Errorf logs a formatted error message.

Errorln logs an error message with a newline character.

Fatal logs a fatal message and exits the program.

Fatalf logs a formatted fatal message and exits the program.

Info logs an info message.

Infof logs a formatted info message.

Warn logs a warning message.

Warnf logs a formatted warning message.