Debug starts a new message with debug level.

Err starts a new message with error level with err as a field if not nil or with info level if err is nil.

Error starts a new message with error level.

Fatal starts a new message with fatal level.

Info starts a new message with info level.

Init log.

Panic starts a new message with panic level.

Trace starts a new message with trace level.

Warn starts a new message with warn level.