Filename, plugin name, version, the operation performed and the WordPress error message where there was one. A batch of eighteen produces eighteen outcomes, not a single pass or fail.
Download any report as Excel-safe CSV and send it to whoever asked. Handover documentation that took no writing.
Reports live in your own database until you delete them, so the question “what did we put on this site in March” has an answer. Individual reports and the whole history can both be cleared.
Not the contents of the uploaded ZIPs, and not credentials. A report is a record of operations, not a copy of your software.
Six months after a handover, somebody asks which version of which plugin the site started with. A batch tool that returns one pass-or-fail cannot answer that. A per-plugin record can, and it took nobody any writing to produce.