As with any new releases, MySQL 8.0.21 introduces many new improvements and updates, many of which deserve their own blog post for a deep dive into the new features.  Among the notable changes are: Account Management Notes, JSON Notes, Authentication Notes and changes related to InnoDB, Optimizer, Group Replication, and more.

Here are the MySQL 8.0.21 top blog posts:

Server:
– The MySQL 8.0.21 Maintenance Release is Generally Available
– MySQL 8.0 – Who stopped mysqld and how long did it take?
– MySQL: who’s filling my error log?

Shell:
– MySQL Shell Dump & Load part 1: Demo! 
– MySQL Shell Dump & Load part 2: Benchmarks 

Optimizer:
– PHP With MySQL: JSON_VALUE() now in MySQL 8.0.21 

InnoDB:
– MySQL – Keep an eye on your auto_increment values 

Replication:
– MySQL 8.0.21 Replication Enhancements 
– More Robust Network Partition Handling in Group Replication 
– START GROUP_REPLICATION can now take recovery credentials as parameters 
– Group Replication SYSTEM messages in the error log
– Specify Recovery IP Addresses in Group Replication 
– MySQL Group Replication – Default response to network partitions has changed
– You Can Now Use Binary Log Checksums with Group Replication

Security:
– Help with MySQL and Data for PHP Developers 

Certifications:
– MySQL 8.0 Certifications  

community blogs:
– MySQL 8.0.21: thank you for the contributions
– Changes that I like in the new MySQL 8.0.21 

Download MySQL 8.0.21 now: https://www.mysql.com/downloads/