At the moment, an unprocessed entity that has failed to be processed will fail "silently" and the error is sometimes only exposed in the backend logs. This plugin exposes these errors and allows them to be viewed in the frontend. 

This involves adding the following 2 plugins to RHDH

1. Frontend plugin: https://www.npmjs.com/package/@backstage/plugin-catalog-unprocessed-entities
2. Backend plugin: https://www.npmjs.com/package/@backstage/plugin-catalog-backend-module-unprocessed

Adding this plugin to RHDH supplies more useful information for debugging catalog entity errors than the logs.