The domain-grouping premise is testable, so it was tested before drawing a
list. Co-change across the full history of the module catalogue, current
modules only, platform namespace excluded.
Nine commits in ten touch exactly one module, and 50 of 89 modules have
never been edited alongside anything. Two clusters exist above that floor.
Reachability holds up: proxy, resolver, firewall and VPN genuinely move
together under one intent, three times in recent history. That is the shape
ADR 0017 describes and the only place the measurement finds it.
The provider cluster does not, and this is the finding worth having. Every
multi-provider commit is a cross-cutting manifest change applied N times —
feature detection, hook conventions, volume binds, network scoping. None is
a change to what a database is. Merging them would not have prevented one
of those commits, and the history already shows the fix that worked:
verify by shape in the SDK rather than copying a script into every module.
Move the concern into the machinery, do not merge the modules carrying it.
ADR 0017 keeps its principle and gains a pointer to this narrowing.
jschoubben
143f8ab2f1