Changing the default value (3) of log_error_verbosity in MySQL/Percona Server for MySQL 5.7 can have a hidden unintended effect! What does log_error_verbosity do exactly? As per the documentation: “The log_error_verbosity system variable specifies the verbosity for handling events intended for the error log.“ Basically a value of 1 logs only [Errors]; 2 is 1)+[Warnings]; and [&]

https://www.percona.com/blog/2020/10/16/danger-of-changing-default-of-log_error_verbosity-on-mysql-percona-server-for-mysql-5-7/