public async Task TestMetricsAsync()
        {
            _counters.IncrementOne("test.counter1");
            _counters.Stats("test.counter2", 2);
            _counters.Last("test.counter3", 3);
            _counters.TimestampNow("test.counter4");

            String status = await Invoke("/metrics");

            Assert.NotNull(status);
            Assert.True(status.Length > 0);
        }