diff --git a/docuploader/protos/metadata.proto b/docuploader/protos/metadata.proto
index bcc8da9..4833603 100644
--- a/docuploader/protos/metadata.proto
+++ b/docuploader/protos/metadata.proto
@@ -54,5 +54,15 @@ message Metadata {
     // The issue tracker. For example the Node Storage client's issue tracker is https://github.com/googleapis/nodejs-storage/issues
     string issue_tracker = 8;
 
+    // The fields below are advanced and should only be set with consultation
+    // from googleapis-dot-dev-team@.
+
+    // The published stem for this docset. If unspecified, it will be set to
+    // `{language}/{name}`.
+    string stem = 9;
+
+    // The serving path for this docset. If unspecified, it will be set to
+    // `{stem}/{version}`.
+    string serving_path = 10;
 
 }
diff --git a/docuploader/protos/metadata_pb2.py b/docuploader/protos/metadata_pb2.py
index cd4af7c..efa30c4 100644
--- a/docuploader/protos/metadata_pb2.py
+++ b/docuploader/protos/metadata_pb2.py
@@ -23,7 +23,7 @@
     syntax="proto3",
     serialized_options=None,
     serialized_pb=_b(
-        '\n\x0emetadata.proto\x12\x13yoshi.docs.metadata\x1a\x1fgoogle/protobuf/timestamp.proto"\xcf\x01\n\x08Metadata\x12/\n\x0bupdate_time\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x0c\n\x04name\x18\x02 \x01(\t\x12\x0f\n\x07version\x18\x03 \x01(\t\x12\x10\n\x08language\x18\x04 \x01(\t\x12\x19\n\x11\x64istribution_name\x18\x05 \x01(\t\x12\x14\n\x0cproduct_page\x18\x06 \x01(\t\x12\x19\n\x11github_repository\x18\x07 \x01(\t\x12\x15\n\rissue_tracker\x18\x08 \x01(\tb\x06proto3'
+        '\n\x0emetadata.proto\x12\x13yoshi.docs.metadata\x1a\x1fgoogle/protobuf/timestamp.proto"\xf3\x01\n\x08Metadata\x12/\n\x0bupdate_time\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x0c\n\x04name\x18\x02 \x01(\t\x12\x0f\n\x07version\x18\x03 \x01(\t\x12\x10\n\x08language\x18\x04 \x01(\t\x12\x19\n\x11\x64istribution_name\x18\x05 \x01(\t\x12\x14\n\x0cproduct_page\x18\x06 \x01(\t\x12\x19\n\x11github_repository\x18\x07 \x01(\t\x12\x15\n\rissue_tracker\x18\x08 \x01(\t\x12\x0c\n\x04stem\x18\t \x01(\t\x12\x14\n\x0cserving_path\x18\n \x01(\tb\x06proto3'
     ),
     dependencies=[google_dot_protobuf_dot_timestamp__pb2.DESCRIPTOR],
 )
@@ -180,6 +180,42 @@
             serialized_options=None,
             file=DESCRIPTOR,
         ),
+        _descriptor.FieldDescriptor(
+            name="stem",
+            full_name="yoshi.docs.metadata.Metadata.stem",
+            index=8,
+            number=9,
+            type=9,
+            cpp_type=9,
+            label=1,
+            has_default_value=False,
+            default_value=_b("").decode("utf-8"),
+            message_type=None,
+            enum_type=None,
+            containing_type=None,
+            is_extension=False,
+            extension_scope=None,
+            serialized_options=None,
+            file=DESCRIPTOR,
+        ),
+        _descriptor.FieldDescriptor(
+            name="serving_path",
+            full_name="yoshi.docs.metadata.Metadata.serving_path",
+            index=9,
+            number=10,
+            type=9,
+            cpp_type=9,
+            label=1,
+            has_default_value=False,
+            default_value=_b("").decode("utf-8"),
+            message_type=None,
+            enum_type=None,
+            containing_type=None,
+            is_extension=False,
+            extension_scope=None,
+            serialized_options=None,
+            file=DESCRIPTOR,
+        ),
     ],
     extensions=[],
     nested_types=[],
@@ -190,7 +226,7 @@
     extension_ranges=[],
     oneofs=[],
     serialized_start=73,
-    serialized_end=280,
+    serialized_end=316,
 )
 
 _METADATA.fields_by_name[
diff --git a/docuploader/protos/metadata_pb2.pyi b/docuploader/protos/metadata_pb2.pyi
index 9d99d55..7e7fc97 100644
--- a/docuploader/protos/metadata_pb2.pyi
+++ b/docuploader/protos/metadata_pb2.pyi
@@ -1,5 +1,4 @@
 # @generated by generate_proto_mypy_stubs.py.  Do not edit!
-import sys
 from google.protobuf.message import Message as google___protobuf___message___Message
 
 from google.protobuf.timestamp_pb2 import (
@@ -8,8 +7,6 @@ from google.protobuf.timestamp_pb2 import (
 
 from typing import Optional as typing___Optional, Text as typing___Text
 
-from typing_extensions import Literal as typing_extensions___Literal
-
 class Metadata(google___protobuf___message___Message):
     name = ...  # type: typing___Text
     version = ...  # type: typing___Text
@@ -18,6 +15,8 @@ class Metadata(google___protobuf___message___Message):
     product_page = ...  # type: typing___Text
     github_repository = ...  # type: typing___Text
     issue_tracker = ...  # type: typing___Text
+    stem = ...  # type: typing___Text
+    serving_path = ...  # type: typing___Text
     @property
     def update_time(self) -> google___protobuf___timestamp_pb2___Timestamp: ...
     def __init__(
@@ -32,43 +31,10 @@ class Metadata(google___protobuf___message___Message):
         product_page: typing___Optional[typing___Text] = None,
         github_repository: typing___Optional[typing___Text] = None,
         issue_tracker: typing___Optional[typing___Text] = None,
+        stem: typing___Optional[typing___Text] = None,
+        serving_path: typing___Optional[typing___Text] = None,
     ) -> None: ...
     @classmethod
     def FromString(cls, s: bytes) -> Metadata: ...
     def MergeFrom(self, other_msg: google___protobuf___message___Message) -> None: ...
     def CopyFrom(self, other_msg: google___protobuf___message___Message) -> None: ...
-    if sys.version_info >= (3,):
-        def HasField(
-            self, field_name: typing_extensions___Literal[u"update_time"]
-        ) -> bool: ...
-        def ClearField(
-            self,
-            field_name: typing_extensions___Literal[
-                u"distribution_name",
-                u"github_repository",
-                u"issue_tracker",
-                u"language",
-                u"name",
-                u"product_page",
-                u"update_time",
-                u"version",
-            ],
-        ) -> None: ...
-    else:
-        def HasField(
-            self,
-            field_name: typing_extensions___Literal[u"update_time", b"update_time"],
-        ) -> bool: ...
-        def ClearField(
-            self,
-            field_name: typing_extensions___Literal[
-                b"distribution_name",
-                b"github_repository",
-                b"issue_tracker",
-                b"language",
-                b"name",
-                b"product_page",
-                b"update_time",
-                b"version",
-            ],
-        ) -> None: ...