Scheduling behaviour for multi-instance apps

[bryophyta]

What is being recommended?

Leveraging an app's load balancer to schedule tasks with side-effects on multi-instance apps.

What's the context?

This is a problem that my team and I have come across a few times, and describes a solution that we've found to work well in production a few times.

I presented on this approach at Server Side Meetup a couple of months ago and it was generally well-received, and I've incorporated some extra considerations that were raised in discussion into this recommendation.