code: def test_metrics_initialization():
      o = bentoml.metrics.Gauge(
          name="test_metrics", documentation="test"
      )
      assert isinstance(o, bentoml.metrics._LazyMetric)
      assert o._proxy is None
      o = bentoml.metrics.Histogram(
          name="test_metrics", documentation="test"
      )
      assert isinstance(o, bentoml.metrics._LazyMetric)
      assert o._proxy is None
      o = bentoml.metrics.Counter(
          name="test_metrics", documentation="test"
      )
      assert isinstance(o, bentoml.metrics._LazyMetric)
      assert o._proxy is None
      o = bentoml.metrics.Summary(
          name="test_metrics", documentation="test"
      )
      assert isinstance(o, bentoml.metrics._LazyMetric)
      assert o._proxy is None
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_metrics_initialization() without return types