Ask HN: Books/Presentations on Google/Meta's internal sw infra/processes?

I've heard that unlike most companies that cobble together software dev systems by mashing disparate products (confluence, slack, jira, github, terraform, etc.), opensource pieces (ELK, Prometheus, argo-cd, etc.) and software-defined-infra (cloud providers), both Google and Meta have well integrated, bespoke infra for all aspects of software development. Is there a book or blog or some reference to how this works? Is it really a thing of beauty and efficiency or you don't really miss it once you leave?