Policy to detect multiple logging servers?

Hi,

I'm trying to use NCM Policies to detect when there are additional logging servers configured on Cisco switches apart from the current server (or multiple servers in the future).

For example, the policy rule would report a violation if the command "logging 10.1.1.1" doesn't exist but would also report a violation if other logging servers were set in the configuration.

I tried using matching multiple usernames with Boolean rules in NCM policy as a starting point but haven't had much luck.

Has anyone else tried to do this or a similar policy?