A half-educated guess:
For the Stackage migration, we have powered down the old snapshot builder […]
It’s really easy to find unexpected data dependencies during a migration, so I have taken the time to document the architecture as I go. Snapshot curation, the process that was just migrated, still relies on some non-migrated components. […] Ideally nobody will ever notice any change during this migration, but if something does go wrong, I want there to be as few moving parts as possible.
…migrations or upgrades - so much fun!