func (g *Group) StartWithChannel(stopCh <-chan struct{}, f func(stopCh <-chan struct{})) {
	g.Start(func() {
		f(stopCh)
	})
}

// StartWithContext starts f in a new goroutine in the group.
// ctx is passed to f as an argument. f should stop when ctx.Done() is available.
func (g *Group) StartWithContext(ctx context.Context, f func(context.Context)) {
	g.Start(func() {
		f(ctx)
	})
}

// Start starts f in a new goroutine in the group.