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diff --git a/google/api_core/gapic_v1/client_info.py b/google/api_core/gapic_v1/client_info.py
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+# Copyright 2017 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Helpers for providing client information.
+
+Client information is used to send information about the calling client,
+such as the library and Python version, to API services.
+"""
+
+from google.api_core import client_info
+
+
+METRICS_METADATA_KEY = "x-goog-api-client"
+
+
+class ClientInfo(client_info.ClientInfo):
+    """Client information used to generate a user-agent for API calls.
+
+    This user-agent information is sent along with API calls to allow the
+    receiving service to do analytics on which versions of Python and Google
+    libraries are being used.
+
+    Args:
+        python_version (str): The Python interpreter version, for example,
+            ``'3.9.6'``.
+        grpc_version (Optional[str]): The gRPC library version.
+        api_core_version (str): The google-api-core library version.
+        gapic_version (Optional[str]): The sversion of gapic-generated client
+            library, if the library was generated by gapic.
+        client_library_version (Optional[str]): The version of the client
+            library, generally used if the client library was not generated
+            by gapic or if additional functionality was built on top of
+            a gapic client library.
+        user_agent (Optional[str]): Prefix to the user agent header. This is
+            used to supply information such as application name or partner tool.
+            Recommended format: ``application-or-tool-ID/major.minor.version``.
+    """
+
+    def to_grpc_metadata(self):
+        """Returns the gRPC metadata for this client info."""
+        return (METRICS_METADATA_KEY, self.to_user_agent())
+
+
+DEFAULT_CLIENT_INFO = ClientInfo()