Older versions of SmarterMail had more performance counters, it would be great if we could get back some of those and even some new ones

- IDS blocks count

- Thread counts for different protocols, like IMAP, POP, relay etc.

- Report system total counts for domains, users, aliases and lists

We can do all this via the API of course, but since SM itself is already running and reporting counters, would be easier to extend our existing perf counter sensors to add others instead of having to build out custom sensors to talk to the SM API.