[jlouis]

It's totally unreadable. There's 5% meat in it almost at the very end, the rest is about selling the feature.

The problem is that if you have multiple branches going into the same (mono)-repo, then they might all pass a localized CI-check, but fail if they are all merged. This is because the branches have an interaction between them. It can lead to a stall in commits and because everything hinges on the repo, work is going to stall as well.

So you serialize the branches, and impose an order on them: [x_1, x_2, x_3, ...]. Now, when running CI on one of these, x_j say, you do so in a temporary branch containing every branch x_i with i < j. This will avoid a stall up to branch x_j, if you started to merge the branches in order. If CI fails on branch x_j, you remove it from the list (queue) of branches to be merged and continue.