feat: launch transfer manager to GA (#1159)

* feat: launch transfer manager to GA

* re-add import...

google/cloud/storage/transfer_manager.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Concurrent media operations. This is a PREVIEW FEATURE: API may change."""
+"""Concurrent media operations."""
 
 import concurrent.futures
 
@@ -40,12 +40,6 @@
 from google.resumable_media.requests.upload import XMLMPUPart
 from google.resumable_media.common import DataCorruption
 
-warnings.warn(
-    "The module `transfer_manager` is a preview feature. Functionality and API "
-    "may change. This warning will be removed in a future release."
-)
-
-
 TM_DEFAULT_CHUNK_SIZE = 32 * 1024 * 1024
 DEFAULT_MAX_WORKERS = 8
 MAX_CRC32C_ZERO_ARRAY_SIZE = 4 * 1024 * 1024
@@ -120,8 +114,6 @@ def upload_many(
 ):
     """Upload many files concurrently via a worker pool.
 
-    This function is a PREVIEW FEATURE: the API may change in a future version.
-
     :type file_blob_pairs: List(Tuple(IOBase or str, 'google.cloud.storage.blob.Blob'))
     :param file_blob_pairs:
         A list of tuples of a file or filename and a blob. Each file will be
@@ -278,8 +270,6 @@ def download_many(
 ):
     """Download many blobs concurrently via a worker pool.
 
-    This function is a PREVIEW FEATURE: the API may change in a future version.
-
     :type blob_file_pairs: List(Tuple('google.cloud.storage.blob.Blob', IOBase or str))
     :param blob_file_pairs:
         A list of tuples of blob and a file or filename. Each blob will be downloaded to the corresponding blob by using APIs identical to blob.download_to_file() or blob.download_to_filename() as appropriate.
@@ -432,8 +422,6 @@ def upload_many_from_filenames(
 ):
     """Upload many files concurrently by their filenames.
 
-    This function is a PREVIEW FEATURE: the API may change in a future version.
-
     The destination blobs are automatically created, with blob names based on
     the source filenames and the blob_name_prefix.
 
@@ -622,8 +610,6 @@ def download_many_to_path(
 ):
     """Download many files concurrently by their blob names.
 
-    This function is a PREVIEW FEATURE: the API may change in a future version.
-
     The destination files are automatically created, with paths based on the
     source blob_names and the destination_directory.
 
@@ -792,8 +778,6 @@ def download_chunks_concurrently(
 ):
     """Download a single file in chunks, concurrently.
 
-    This function is a PREVIEW FEATURE: the API may change in a future version.
-
     In some environments, using this feature with mutiple processes will result
     in faster downloads of large files.
 

tests/unit/test_transfer_manager.py

@@ -14,11 +14,9 @@
 
 import pytest
 
-with pytest.warns(UserWarning):
-    from google.cloud.storage import transfer_manager
-
 from google.cloud.storage import Blob
 from google.cloud.storage import Client
+from google.cloud.storage import transfer_manager
 
 from google.api_core import exceptions