use warnings.warn instead of _LOGGER.debug

Author: parthea

google/api_core/grpc_helpers.py

@@ -17,7 +17,6 @@
 
 import collections
 import functools
-import logging
 import warnings
 
 import grpc
@@ -53,8 +52,6 @@
 # The list of gRPC Callable interfaces that return iterators.
 _STREAM_WRAP_CLASSES = (grpc.UnaryStreamMultiCallable, grpc.StreamStreamMultiCallable)
 
-_LOGGER = logging.getLogger(__name__)
-
 # denotes the proto response type for grpc calls
 P = TypeVar("P")
 
@@ -373,8 +370,9 @@ def create_channel(
     # Note that grpcio-gcp is deprecated
     if HAS_GRPC_GCP:  # pragma: NO COVER
         if compression is not None and compression != grpc.Compression.NoCompression:
-            _LOGGER.debug(
-                "Compression argument is being ignored for grpc_gcp.secure_channel creation."
+            warnings.warn(
+                "The `compression` argument is ignored for grpc_gcp.secure_channel creation.",
+                DeprecationWarning,
             )
         if attempt_direct_path:
             warnings.warn(