public override BsonValue Render()
 {
     return(new BsonDocument
     {
         { "$collStats", new BsonDocument
           {
               { "latencyStats", () => _latencyStats.Render(), _latencyStats != null },
               { "storageStats", () => _storageStats.Render(), _storageStats != null },
               { "count", () => _count.Render(), _count != null },
               { "queryExecStats", () => _queryExecStats.Render(), _queryExecStats != null }
           } }
     });
 }