It comes up a lot in split repos or split deployments. To make a change you need to deploy part of it here, then another part over there, and maybe fiddle with

It comes up a lot in split repos or split deployments. To make a change you need to deploy part of it here, then another part over there, and maybe fiddle with some settings in between. So your story ends up with several PRs that have to land in a specific order or things break. Eg client calling a new endpoint that doesn’t exist yet. We call these chains of dependent reviews “stacked” for reasons I’m not entirely clear on.