chore: adding warning about experimental feature

Signed-off-by: Aaron Pham <29749331+aarnphm@users.noreply.github.com>

src/bentoml/_internal/utils/__init__.py

@@ -69,7 +69,7 @@
 _EXPERIMENTAL_APIS: set[str] = set()
 
 
-def _warn_experimental(api_name: str) -> None:
+def warn_experimental(api_name: str) -> None:
     if api_name not in _EXPERIMENTAL_APIS:
         _EXPERIMENTAL_APIS.add(api_name)
         msg = "'%s' is an EXPERIMENTAL API and is currently not yet stable. Proceed with caution!"
@@ -86,7 +86,7 @@ def experimental(
     def decorator(func: t.Callable[..., t.Any]) -> t.Callable[P, t.Any]:
         @functools.wraps(func)
         def wrapper(*args: P.args, **kwargs: P.kwargs) -> t.Any:
-            _warn_experimental(api_name)
+            warn_experimental(api_name)
             return func(*args, **kwargs)
 
         return wrapper

src/bentoml/metrics.py

@@ -7,7 +7,7 @@
 from simple_di import inject
 from simple_di import Provide
 
-from ._internal.utils import _warn_experimental
+from ._internal.utils import warn_experimental
 from ._internal.utils import add_experimental_docstring
 
 if TYPE_CHECKING:
@@ -35,8 +35,13 @@ def __init__(self, attr: t.Any):
     def __call__(self, *args: t.Any, **kwargs: t.Any) -> t.Any:
         """
         Lazily initialize the metrics object.
+
+        Args:
+            *args: Arguments to pass to the metrics object.
+            **kwargs: Keyword arguments to pass to the metrics object.
         """
         # This is where we lazy load the proxy object.
+        warn_experimental("%s.%s" % (__name__, self._attr))
         self._args = args
         self._kwargs = kwargs
         return self