Improvements to Undo Truncation in MySQL 8.0.21
Undo Tablespaces can be truncated either implicitly or explicitly in MySQL 8.0. Both methods use the same mechanism. This mechanism could cause periodic stalls on very busy systems while an undo tablespace truncate completes. This problem has been fixed in MySQL 8.0.21.…
Source: Improvements to Undo Truncation in MySQL 8.0.21
