MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
[+/-]
The following sections describe tables that do not fall into the table categories discussed in the preceding sections:
host_cache: Information from the internal host cacheperformance_timers: Which event timers are availablethreads: Information about server threadsuser_defined_functions: User-defined functions registered by a server component, plugin, orCREATE FUNCTIONstatementlog_status: Information about server logs for backup purposes