This is mostly for use by LogProviders; adds fields to a raw context.Context If you're looking to derive from the default ContextLogger, you want log.WithFields.

This can be combined with an object that already supplies context.Context, without conflict, to create a ContextLogger; it's not really intended to be used standalone, and in most cases you probably want to include ContextLogger rather than this in other interfaces/structs.

ContextLoggers are designed to be passed around for convenience within a given project; APIs which are meant to be used from other projects should use the standard golang context.Context interface instead, for broad compatibility.