Bumping your post. We have a similar question. I hope one of the Intel/Mcafee Moderators could perhaps answer this.
How to you create automated reports for systems that haven't logged to SIEM in X ? On the ESM you can export the "Last Event Time" manually. On the receivers you can look at the Time Delta component.
Maybe anybody else on the forum know some way around this?
This is probably not exactly what you are looking for but here is what I have. I don't currently have a report running but what I have set up is an alarm that runs every 4 hours for devices that have a time delta exceeding 1 hour. Once you have the alarm setup, generating a report shouldn't be to much of a hassle. I just haven't done it yet. Hopefully this helps.