Peformance collection/threshold

The instructions (Click here) should be fine, as long as the overrides are configured to target "All objects of another type" and the target points to an F5 Device derived object/entity. After the overrides have been set you can immediately refresh the collection of the related stats by forcing the f5mpcmd /rcr command (see the instructions in the article mentioned above), otherwise the refresh cycle could take up to 5 minutes. If you still can't get the stats, could you please drop the override summary here for some of the rules you're trying to collect, to get a better idea of how they're configured.