1. Check the error log for the MySQL 3158 error:

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

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2. Check the MySQL configuration file for any misconfigurations:

$ cat /etc/mysql/my.cnf

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

$ mysqladmin -u root -p processlist

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

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

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

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

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6. Check the MySQL system variables for any misconfigurations:

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

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7. Check the MySQL system status for any misconfigurations:

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

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8. Use an automated database observability tool to monitor and fix the MySQL 3158 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.