Most people going on a holiday prefer to have the chores of feeding the fish assigned to neighbors or even friends. For me, depending on the number of day that I will be gone, usually it’s either I leave it alone without any intervention (if it’s only 3-4 days) but for longer period, maybe up to a week, then I will get an automatic fish feeder to help with the task.
There are many reasons why I prefer not to have someone else feeding my pet. First of all, the person may not have experience with fish keeping and thus does not know how much to feed. In this case, there might be a risk of overfeeding and fouling the water. Second I prefer not to have strangers walking into my house and then leaving. That’s why for that reason an automatic fish feeder is good enough to take care of everything until I'm back from holiday.