The values should be the number of items per second, not the completed items per second.
I want the number of ops that end within that interval + active ops at the end of the interval.
If you have 5 queries/ops running for 3 seconds you should not see 0, 0, 5 for the first, second, and third lines for that metric (where each line is at 1 second intervals).
If there are N queries/ops running for a long period of time it should never report 0 for any of those intervals during the time that they are running.
It is not what I expected. I expected that it would list the number of active queries/ops in that second; that would be like any other counter or metric in another server. I don't expect to see 0s when things are active.
See Aaron's comment from http://jira.mongodb.org/browse/SERVER-1745