1. Check the error log for the MySQL 125 error:

$ tail -f /var/log/mysql/error.log

2. Check the MySQL configuration file for any misconfigurations:

$ cat /etc/mysql/my.cnf

3. Check the MySQL process list for any suspicious activity:

$ mysqladmin -u root -p processlist

4. Check the MySQL user table for any suspicious users:

$ mysql -u root -p -e "SELECT * FROM mysql.user;"

5. Check the MySQL grant tables for any suspicious grants:

$ mysql -u root -p -e "SELECT * FROM mysql.db;"

6. Check the MySQL system variables for any misconfigurations:

$ mysql -u root -p -e "SHOW VARIABLES;"

7. Check the MySQL status variables for any misconfigurations:

$ mysql -u root -p -e "SHOW STATUS;"

8. Check the MySQL log files for any suspicious activity:

$ tail -f /var/log/mysql/mysql.log

9. Check the MySQL slow query log for any slow queries:

$ tail -f /var/log/mysql/slow.log

10. Use an automated database observability tool to monitor and fix the MySQL 125 in question. Automated database observability tools can provide real-time insights into the performance and health of your database, allowing you to quickly identify and fix any issues that may arise. These tools can also provide detailed metrics and logs that can help you diagnose and troubleshoot any issues that may arise.