ADR-023 captures why prometheus-fastapi-instrumentator was chosen,
the build_metrics(registry) factory pattern, and the test rebinding
seam. The glossary gains four ops-aligned terms — illegible word,
models-ready gauge, recognition vs segmentation accuracy — so the
metrics documentation in OBSERVABILITY.md has a vocabulary to lean on.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
