Move metrics library to index.md to generate the proper breadcrumbs
Since there is no index.md for the Prometheus metrics library, the breadcrumbs are being created properly. We should move this page, and link back to it from the old location.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Since there is no index.md for the Prometheus metrics library, the breadcrumbs are being created properly. We should move this page, and link back to it from the old location.