NewContext returns a context has a zap logger with the extra fields added.

NewContextWithGeneratedID returns a context with a generated id with a zap logger and an id field.

NewContextWithID returns a context which has a zap logger and an id field.

NewContextWithLogger returns a context with the provided logger set as a context value.

ReadContextID returns the context's id or "undefined".

WithContext returns a zap logger with as much context as possible.