Hey @pkirwan,
Congrats on your first post and welcome to the Discussion Forum Community! My initial take is that it’s an “All Time” count, but I’m confirming as I’m writing this and will edit this post with the official answer.
Edit: from what I’ve been told, this count starts from the beginning of IDR (installing of the agent on the endpoint) and will just increase based on asset authentications captured by the specific endpoint’s agent.