This is actually a short post to write, as the state of the GrabPERF system is currently very healthy. There was an eight-hour outage in early August 2008, but that was a fiber connectivity issue, not a system issue.
Over the history of ther service, we have been steadily increasing the number of measurements we take each day.
The large leap occurred when a very large number of tests were added to the system on a single day. But based on this data, the system is gathering more than 900,000 measurements every day.
Thanks to all of the people who volunteer their machines and bandwidths to support this effort!