opts.go
func EntriesService(service *logging.EntriesService) Option {
	return func(sh *StackdriverHook) error {
		sh.service = service
		return nil
	}
}
func EntriesService(service *logging.EntriesService) Option {
	return func(sh *StackdriverHook) error {
		sh.service = service
		return nil
	}
}
// EntriesService is an option that sets the Google API entry service to use
// with Stackdriver.