1. Check the error log for the MySQL 3187 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 User, Host FROM mysql.user;"

5. Check the MySQL grants table for any suspicious grants:

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

6. Check the MySQL privileges table for any suspicious privileges:

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

7. Check the MySQL tables for any suspicious data:

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

8. Check the MySQL logs for any suspicious activity:

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

9. Use an automated database observability tool to monitor and fix the MySQL 3187 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 identify the root cause of any issues, as well as provide recommendations on how to fix them.