Add examples for usage with external tracking tools

tests/integration/test_single_node.py

@@ -15,18 +15,25 @@ def run(self):
         self.c = self.a + self.b
 
 
+class AddNumbersMetrics(AddNumbers):
+    c = zntrack.zn.metrics()
+
+
 @pytest.mark.parametrize("eager", [True, False])
 def test_AddNumbers(proj_path, eager):
     with zntrack.Project() as project:
-        add_numbers = AddNumbers(a=1, b=2)
+        add_numbers = AddNumbersMetrics(a=1, b=2)
 
     assert not add_numbers.state.loaded
 
     project.run(eager=eager)
     if not eager:
         add_numbers.load()
+        assert add_numbers.state.params == {"a": 1, "b": 2}
+
     assert add_numbers.c == 3
     assert add_numbers.state.loaded
+    assert add_numbers.name == "AddNumbersMetrics"
 
 
 def test_AddNumbers_remove_params(proj_path):

zntrack/core/node.py

@@ -55,6 +55,8 @@ class NodeStatus:
     remote: str = None
     rev: str = None
 
+    parent: Node = dataclasses.field(default=None, repr=False)
+
     def get_file_system(self) -> dvc.api.DVCFileSystem:
         """Get the file system of the Node."""
         log.warning("Deprecated. Use 'state.fs' instead.")
@@ -74,6 +76,21 @@ def fs(self) -> dvc.api.DVCFileSystem:
                 time.sleep(0.1)
         raise dvc.utils.strictyaml.YAMLValidationError
 
+    @property
+    def params(self) -> dict:
+        """Get the parameters of the Node."""
+        params = dvc.api.params_show(
+            stages=self.parent.name,
+            repo=self.remote,
+            rev=self.rev,
+        )
+        return params.get(self.parent.name, {})
+
+    @property
+    def metrics(self) -> dict:
+        """Get the metrics of the Node."""
+        raise ValueError("Not implemented yet.")
+
 
 class _NameDescriptor(zninit.Descriptor):
     """A descriptor for the name attribute."""
@@ -155,7 +172,7 @@ def _init_descriptors_(self):
     def state(self) -> NodeStatus:
         """Get the state of the node."""
         if self._state is None:
-            self._state = NodeStatus(False, NodeStatusResults.UNKNOWN)
+            self._state = NodeStatus(False, NodeStatusResults.UNKNOWN, parent=self)
         return self._state
 
     @property