See https://groups.google.com/forum/#!topic/mongodb-dev/kAu1HTu5sq0. The journaling/dur stats in db.serverStatus() are counters from the last 3 (or maybe from the 3 seconds prior to that). While it is convenient to get recent stats for monitoring this creates problems for external monitoring.
1) now I need to read the stat once per 3 second interval to avoid missing a sample
2) but I don't want to read the data twice within the same 3 second interval

My request is for a new set of counters displayed by db.serverStatus() that are journaling/dur stats which don't get reset every 3 seconds