1. Check the error log for the MySQL 169 instance:

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

2. Check the MySQL configuration file for the instance:

$ sudo cat /etc/mysql/my.cnf

3. Check the MySQL version:

$ mysql --version

4. Check the MySQL status:

$ sudo service mysql status

5. Check the MySQL process list:

$ sudo mysqladmin -u root -p processlist

6. Check the MySQL variables:

$ sudo mysqladmin -u root -p variables

7. Check the MySQL user privileges:

$ sudo mysql -u root -p -e "SELECT User, Host, Password FROM mysql.user;"

8. Check the MySQL database tables:

$ sudo mysql -u root -p -e "SHOW TABLES;"

9. Check the MySQL database table structure:

$ sudo mysql -u root -p -e "DESCRIBE table_name;"

10. Check the MySQL database table indexes:

$ sudo mysql -u root -p -e "SHOW INDEX FROM table_name;"

11. Check the MySQL database table data:

$ sudo mysql -u root -p -e "SELECT * FROM table_name;"

12. Check the MySQL database table locks:

$ sudo mysql -u root -p -e "SHOW OPEN TABLES;"

13. Check the MySQL database table triggers:

$ sudo mysql -u root -p -e "SHOW TRIGGERS;"

14. Check the MySQL database table constraints:

$ sudo mysql -u root -p -e "SHOW CREATE TABLE table_name;"

15. Check the MySQL database table foreign keys:

$ sudo mysql -u root -p -e "SHOW CREATE TABLE table_name;"

16. Check the MySQL database table privileges:

$ sudo mysql -u root -p -e "SHOW GRANTS FOR table_name;"

17. Check the MySQL database table triggers:

$ sudo mysql -u root -p -e "SHOW TRIGGERS;"

18. Check the MySQL database table views:

$ sudo mysql -u root -p -e "SHOW CREATE VIEW view_name;"

19. Check the MySQL database table stored procedures:

$ sudo mysql -u root -p -e "SHOW CREATE PROCEDURE procedure_name;"

20. Check the MySQL database table functions:

$ sudo mysql -u root -p -e "SHOW CREATE FUNCTION function_name;"

21. Finally, use an automated database observability tool to monitor and fix the MySQL 169 in question. Automated database observability tools can provide real-time insights into the performance and health of the database, as well as alerting when issues arise. This can help to quickly identify and fix any issues with the MySQL 169 instance.