@Override
    public void onOutput(OutputEvent event) {
        if (event instanceof ProgressStartEvent) {
            ProgressStartEvent startEvent = (ProgressStartEvent) event;
            if (startEvent.isBuildOperationStart()) {
                if (buildStartTimestamp == 0 && startEvent.getParentProgressOperationId() == null) {
                    // The very first event starts the Initializing phase

        boolean isGrouped = startEvent.getBuildOperationCategory().isGrouped();
        OperationIdentifier progressId = startEvent.getProgressOperationId();
        if (startEvent.isBuildOperationStart() && isGrouped) {
            // Create a new group for tasks or configure project