1. Check the error log for the MySQL 151 instance:

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

2. Check the MySQL configuration file for the instance:

$ cat /etc/mysql/my.cnf

3. Check the system resources available to the instance:

$ free -m

4. Check the MySQL process list for the instance:

$ mysqladmin -u root -p processlist

5. Check the MySQL status for the instance:

$ mysqladmin -u root -p status

6. Check the MySQL variables for the instance:

$ mysqladmin -u root -p variables

7. Check the MySQL user privileges for the instance:

$ mysql -u root -p -e "SHOW GRANTS FOR 'root'@'localhost';"

8. Check the MySQL database tables for the instance:

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

9. Check the MySQL database indexes for the instance:

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

10. Check the MySQL database triggers for the instance:

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

11. Check the MySQL database views for the instance:

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

12. Check the MySQL database stored procedures for the instance:

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

13. Check the MySQL database functions for the instance:

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

14. Check the MySQL database events for the instance:

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

15. Check the MySQL database users for the instance:

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

16. Check the MySQL database privileges for the instance:

$ mysql -u root -p -e "SHOW GRANTS FOR 'user'@'host';"

17. Check the MySQL database replication for the instance:

$ mysql -u root -p -e "SHOW SLAVE STATUS\G;"

18. Check the MySQL database performance for the instance:

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

19. Check the MySQL database connections for the instance:

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

20. Recommend using an automated database observability tool to monitor and fix the MySQL 151 in question. Automated database observability tools can provide real-time insights into the performance and health of the MySQL 151 instance, allowing for quick and easy diagnosis and resolution of any issues. Additionally, these tools can provide alerts and notifications when any issues arise, allowing for proactive resolution of any potential problems.