With a simple snippet like this

	mongo::ScopedDbConnection a("myset/127.0.0.1:27017");
	a.done();

I get repeating warnings in console (of my application) :
2014-02-22T14:22:53.843+0200 [ReplicaSetMonitorWatcher] scoped connection to 127.0.0.1:27017 not being returned to the pool
2014-02-22T14:22:53.843+0200 [ReplicaSetMonitorWatcher] scoped connection to 127.0.0.1:27019 not being returned to the pool

I initially thought it is because my replicaset contains one replica (only primary), but after adding another to the se, I saw the same, except now for both replicas.

What makes this more strange is that the same test with the connection string: "127.0.0.1:27017" (no myset) does not have any warnings.