Is an Alert categorized as a Data Viewer?
Yes, the Alert is categorized as a Data Viewer. From our guides:
Work with Data Viewers
Data viewers in the Investigator viewer pane or in a Console dashboard show data from an instrumented application in a visual form. Data Viewers can display data from a metric, a resource, or an element, such as an alert. When data is not present, the viewer displays a label by type, for example, Text Viewer: no data.