public static String getPortTags(PortsMeta portsMeta, int portNumber) {
        StringBuilder sb = new StringBuilder();
        boolean firstTag = true;
        for (String s : portsMeta.getTagsAt(portNumber)) {
            if (!firstTag) {
                sb.append(" ");
            } else {
                firstTag = false;
            }
            sb.append(s);
        }
        return sb.toString();
    }
Prepares the model for start. The {@link VespaModel} calls
this methods after it has loaded this and all plugins have been loaded and
their initialize() methods have been called.

@param plugins All initialized plugins of the vespa model.
config-model/src/main/java/com/yahoo/config/model/ApplicationConfigProducerRoot.java