NewLogger creates and returns a new instance of Logger.

DebugLevel is the lowest level of logging.

ErrorLevel is used for undesired and unexpected events that the program can recover from.

FatalLevel is used for undesired and unexpected events that the program cannot recover from.

InfoLevel is used for general informational log messages.

WarnLevel is used for undesired but relatively expected events, which may indicate a problem.

Logger logs message to io.Writer at various log levels.

Base supports logging at various log levels.

Level represents a log level.