fix: add api_version to gapic_metadata.json

Author: noahdietz

gapic/schema/api.py

@@ -676,6 +676,9 @@ def gapic_metadata(self, options: Options) -> gapic_metadata_pb2.GapicMetadata:
         for service in sorted(self.services.values(), key=lambda s: s.name):
             service_desc = gm.services.get_or_create(service.name)
 
+            if service.version:
+                service_desc.api_version = service.version
+
             # At least one of "grpc" or "rest" is guaranteed to be present because
             # of the way that Options instances are created.
             # This assumes the options are generated by the class method factory.

tests/unit/schema/test_api.py

@@ -1908,6 +1908,10 @@ def test_map_field_name_disambiguation():
 
 
 def test_gapic_metadata():
+    apiVersion = "2025-11-03"
+    serviceOptions = descriptor_pb2.ServiceOptions()
+    serviceOptions.Extensions[client_pb2.api_version] = apiVersion
+
     api_schema = api.API.build(
         file_descriptors=[
             descriptor_pb2.FileDescriptorProto(
@@ -1941,6 +1945,7 @@ def test_gapic_metadata():
                                 output_type="animalia.mollusca.v1.Mollusc",
                             ),
                         ],
+                        options=serviceOptions,
                     ),
                     descriptor_pb2.ServiceDescriptorProto(
                         name="Octopus",
@@ -1997,6 +2002,7 @@ def test_gapic_metadata():
                 }
             ),
             "Squid": gapic_metadata_pb2.GapicMetadata.ServiceForTransport(
+                api_version=apiVersion,
                 clients={
                     "grpc": gapic_metadata_pb2.GapicMetadata.ServiceAsClient(
                         library_client="SquidClient",
@@ -2060,6 +2066,7 @@ def test_gapic_metadata():
                 }
             ),
             "Squid": gapic_metadata_pb2.GapicMetadata.ServiceForTransport(
+                api_version=apiVersion,
                 clients={
                     "rest": gapic_metadata_pb2.GapicMetadata.ServiceAsClient(
                         library_client="SquidClient",
@@ -2131,6 +2138,7 @@ def test_gapic_metadata():
                 }
             ),
             "Squid": gapic_metadata_pb2.GapicMetadata.ServiceForTransport(
+                api_version=apiVersion,
                 clients={
                     "grpc": gapic_metadata_pb2.GapicMetadata.ServiceAsClient(
                         library_client="SquidClient",