'infos' filter for that notifications. No third parameter will show both.
Notifications on the start page (plugin overview)
Using $lbpplugindir as package, info and error bullets are automatically shown on LoxBerry's start page at your plugin icon.
Notification in the navigation bar
If you use LoxBerry's Navigation Bar, you can add a key to the $navbar variable to directly show the notification bullets in your navigation bar at the appropriate tab. Each notification "name" can match to one tab.
There are several functions to read notifications for different demands.