Why do I see MySQL log messages with "Cpanel::MysqlUtils::Unprivileged" in them?

Question

Why do I see MySQL log messages with Cpanel::MysqlUtils::Unprivileged in them?

CONFIG_TEXT: [Warning] Access denied for user 'Cpanel::MysqlUtils::Unprivileged'@'localhost' (using password: NO)
[Note] Access denied for user 'Cpanel::MysqlUtils::Unprivileged'@'localhost' (using password: NO)

Answer

The messages are created when cPanel processes perform a MySQL version check, starting in cPanel & WHM version 88. Previously, tests for the MySQL version that did not create a full connection would print the error message "Got an error reading communication packets," which can refer to many different connection issues and was not unique.