LoggingImplementation is the top level entry point to our logging API.

CtxHasLoggerFunc is the type of a function that checks whether a context.Context contains a logger.

LogEventCallbackFunc is the type of a callback function you can provide to receive a callback for every log event.

RequestIdRetrieverFunc is the type of a function used to obtain a request id from a context Note: access to the singleton instance is provided in the Logger global variable.