In your deployment, you've probably created Dashboards with Panels that you use to keep an eye on specific issues or help you manage resources. These custom Dashboards are usually full of important data that you rely on.
In Sumo Logic App Dashboards, each Panel uses a very targeted search. In instances where no search results are returned, these Panels will not display any information. Instead, you'll see Panels that show the message "There is no data to display", like this:
This does not mean that the app isn't working. It means that no activity has occurred according to the search running behind the Panel.