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MySQL error code

MySQL error 4011

MySQL server error 4011 is ER_STOP_REPLICA_MONITOR_IO_THREAD_TIMEOUT, reported with SQLSTATE HY000.

STOP REPLICA command execution is incomplete: Replica Monitor thread got the stop signal, thread is busy, Monitor thread will stop once the current task is complete.
Error4011
NameER_STOP_REPLICA_MONITOR_IO_THREAD_TIMEOUT
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference