I'm not sure what the common element here is but I see lots of queries output to the logs without nscanned (or nscannedObjects).
2014-08-14T20:38:44.165+0000 [conn5704] query appdata.Activity query: { $or: [ { _acl: { $exists: false } }, { _acl.a.r: true }, { _acl.b.r: true } ], _id: "" } planSummary: IXSCAN { _id: 1 } ntoskip:0 keyUpdates:0 numYields:0 locks(micros) r:552 nreturned:0 reslen:20 0ms
- related to
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SERVER-15239 serverStatus metrics incorrect: "operation.idhack", "queryExecutor.scanned", "queryExecutor.scannedObjects"
- Closed
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SERVER-15240 serverStatus metric "document.returned" incorrect
- Closed