mongos> use test
switched to db test
mongos> sh.enableSharding("test")

{ "ok" : 1 }

mongos> sh.shardCollection("test.test",

{"x":1}

)

{ "collectionsharded" : "test.test", "ok" : 1 }

mongos> db.serverStatus().ops
{
"sharded" :

{ "insert" : 0, "query" : 0, "update" : 0, "delete" : 0, "getmore" : 0, "command" : 0 }

,
"notSharded" :

{ "insert" : 0, "query" : 21, "update" : 0, "delete" : 0, "getmore" : 0, "command" : 36 }

}
mongos> db.test.insert(

{"x":1}

)
mongos> db.test.find()

{ "_id" : ObjectId("50aad6fe4cd32fd23efbd4cd"), "x" : 1 }

mongos> db.serverStatus().ops
{
"sharded" :

{ "insert" : 0, "query" : 0, "update" : 0, "delete" : 0, "getmore" : 0, "command" : 0 }

,
"notSharded" :

{ "insert" : 0, "query" : 22, "update" : 0, "delete" : 0, "getmore" : 0, "command" : 41 }

}
mongos>

opsSharded was only used in one place, and that was taken out in: https://github.com/mongodb/mongo/commit/1973153321caf7483d0ff10913e196fa367d78f5#L3L125