MySQL Error Message
Failed to remove unused binary log encryption keys from
the keyring, please check if keyring is loaded. The unused binary
log encryption keys may still exist in the keyring, and they will
be removed upon server restart or next ‘ALTER INSTANCE ROTATE
BINLOG MASTER KEY’ execution.
Reason for the Error
ER_BINLOG_MASTER_KEY_ROTATION_FAIL_TO_CLEANUP_UNUSED_KEYS
was added in 8.0.16.