The previous commit continued past every failure, and the lab found the
cost immediately: the bootstrap's store-readiness gate failed, the apply
carried on and started the broker and control plane against a machine
that was not ready, and the database still initialising was shut down.
An action is the only shape whose purpose is to make something true
before the next thing needs it — which is why it is the only one with a
verify. The bootstrap is a row of them. Everything else is independent
state, and stopping there is what made one broken module hold a whole
machine hostage.
The report says which happened: "these things failed" and "these things
failed and the rest was never tried" are different machines.
jschoubben
08e91065b4