If you'd like to archive an insight, simply click on the archive button to the right on the insight card.
If you'd like to view archived insights, just switch from "Current" to "Archived" in the Insights tab of the main Dashboard page.
If you'd like to unarchive an insight, click on the "Unarchive Insight" button to the right on the insight card.
Within each insight, you can view the specific application, environment, and plan to which the insight belongs. The the image below for a breakdown of the respective icons.