field notes codename
60 notes filed under ABACUS, newest first. Same rules as the rest of the pile: a codename, a theme, and no internals.
The archive is the ground truth for every later measurement, so the way it fails matters more than the way it works. The failure found was quiet. The upstream service would occasionally answer a data request with a successful, well-formed,…
elsewhere
Each codename is a project. The theme is the class of problem the note is about — the same theme recurs across projects, which is usually the interesting part.