@Override
    public void notifyAuthenticationRequestReceived(Credentials credentials)
            throws GuacamoleException {
        notifyAuthenticationStatus(credentials, false);
    }
Reports that an authentication request has been received, as well as
whether that request is known to have failed. If the associated address
is currently being blocked, an exception will be thrown.

@param credentials
    The credentials associated with the authentication request.

@param failed
    Whether the request is known to have failed. If the status of the
    request is not yet known, this should be false.

@throws GuacamoleException
    If the authentication request is being blocked due to brute force
    prevention rules.
extensions/guacamole-auth-ban/src/main/java/org/apache/guacamole/auth/ban/status/InMemoryAuthenticationFailureTracker.java