Stat dependent update frequency

[beltex]

• Something that could be handy
• Be able to update stats at a frequency that makes sense for the stat in question. So for example, uptime would really only be useful every minute, rather than every second. As would say battery life. No need to poll frequently in those cases
• The point being, that by having stat dependent timers, you could reduce CPU usage (less work on every update)
• Stat config seen in Allow for configurability of metrics #4 & .dshbrc file - for config #14, will help as well for this

[beltex]

Related to this, some things could even be updated based on notifications only, which would be even better. For example, IOGetSystemLoadAdvisory() (yet to be added), has this note:

"You may more efficiently read the SystemLoadAdvisory level using notify_get_state() instead of IOGetSystemLoadAdvisory. The results are identical. notify_get_state() requires that you pass the token argument received by registering for SystemLoadAdvisory notifications."