CreateLogger create a logger.

CreateLoggerGroup create a logger group.

LevelDebug logs are typically voluminous, and are usually disabled in production.

LevelDPanic logs are particularly important errors.

LevelError logs are high-priority.

LevelFatal logs a message, then calls os.Exit(1).

LevelInfo is the default logging priority.

LevelPanic logs a message, then panics.

LevelWarn logs are more important than Info, but don't need individual human review.

LoggerGroup is a group of logger, which provide loggers w/ different levels for modules.

NoopLogger logger.

ILogger log interface.