Reference
The logger and its options, the filter builders, and the handler primitives.
Most code needs only log.New and the Logger interface. The filter builders and handler primitives are here for filtering and hand-assembly.
Logger
log.New, the options, the Logger interface, Wrap, Discard, and the process-wide default.FiltersThe Deny / Allow / Shorten builders, their match criteria, and the runtime-mutable filter handler.Handlers and levelsThe fan-out handler, the handler options for custom-level names, and the TRACE and FATAL levels.