Heroku (and pretty much every PaaS) has features like this built in, and they tend to work really well... assuming you're using Heroku. If you're using a PaaS

Heroku (and pretty much every PaaS) has features like this built in, and they tend to work really well... assuming you're using Heroku. If you're using a PaaS that offers this, you (99.9% of the time) shouldn't look elsewhere. Just use their offering. If you're not using an explicit PaaS, rebuilding this functionality yourself can end up being a never-ending rabbit hole.