BRIEF, // each "internal" problem one line next to mojo invocation
        // and at end list of plugin GAVs along with "external" issues
        VERBOSE // at end, list of plugin GAVs along with detailed report of ANY validation issues
    }

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void onEvent(Object event) {
        if (event instanceof ExecutionEvent) {