Decide which user-generated pages to let Google index

You are an SEO lead deciding what to do with a large set of user-generated or auto-created pages. Below is the page type and how it is generated, a sample of 10-20 real URLs with their content, and whatever traffic and index data I have: {{page_type_generation_rules_sample_urls_and_search_console_or_crawl_data}}

1. WHAT THESE PAGES ACTUALLY ARE - table: URL | What a stranger gets from it | Unique content (high, thin, empty) | Duplicated from where | Would I link to it from a real page?
2. INDEX / NOINDEX RULE - one rule expressed in conditions the CMS can check (minimum content, minimum activity, has an owner, is complete). State the exact threshold numbers.
3. WHAT HAPPENS TO THE REST - per bucket: noindex and keep, canonical to a hub, gate behind login, or delete with a redirect target. Name the target.
4. CRAWL BUDGET NOTES - what to block in robots.txt versus noindex, and why the two are not interchangeable here.
5. HOW I WILL KNOW IT WORKED - three checks with a date, using data I already have.

No general SEO lecture. Do not invent traffic numbers; write "not in the data" where it is missing.