CONNECTION_CONTROL checks incoming connections and adds a delay to server responses as necessary. This plugin also exposes system variables that enable its operation to be configured and a status variable that provides rudimentary monitoring information.

The CONNECTION_CONTROL plugin uses the audit plugin interface (see Section 29.2.4.8, “Writing Audit Plugins”). To collect information, it subscribes to the MYSQL_AUDIT_CONNECTION_CLASSMASK event class, and processes MYSQL_AUDIT_CONNECTION_CONNECT and MYSQL_AUDIT_CONNECTION_CHANGE_USER subevents to check whether the server should introduce a delay before responding to client connection attempts.

CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS implements an INFORMATION_SCHEMA table that exposes more detailed monitoring information for failed connection attempts.