Acknowledgement Status on a DiagnosticReport

How best do I handle that I have seen this particular DiagnosticReport? Like an acknowledgement. One piece is acknowledging this result and other is can i filter on those that are unacknowledged?

Personally, I’d use a task - create task that would be deleted once review happened, and an AuditRecord for the actual review

but you could also use a tag (Resource.meta.tag)