MySQL 8 Administrator???s Guide

Variables related to CONNECTION-CONTROL

The following variables are provided by CONNECTION-CONTROL plugins:

• Connection_control_delay_generated: This is a status variable, mainly used to manage the counter. It indicates how many times the server added a delay in its response on failed connection attempts. It also depends on the connection_control_failed_connections_threshold system variable, because this status variable does not increment the count unless the number of attempts reaches the limit defined by the threshold variable.
• connection_control_failed_connections_threshold: This is a system variable which indicates how many consecutive failed attempts are allowed to clients before the server adds a delay on each attempt.
• connection_control_max_connection_delay ...