diff --git a/packages/google-cloud-appengine-admin/.pre-commit-config.yaml b/packages/google-cloud-appengine-admin/.pre-commit-config.yaml
index 55cc59efc686..8912e9b5d7d7 100644
--- a/packages/google-cloud-appengine-admin/.pre-commit-config.yaml
+++ b/packages/google-cloud-appengine-admin/.pre-commit-config.yaml
@@ -26,6 +26,6 @@ repos:
     hooks:
     - id: black
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+    rev: 3.9.0
     hooks:
     - id: flake8
diff --git a/packages/google-cloud-appengine-admin/docs/appengine_admin_v1/types.rst b/packages/google-cloud-appengine-admin/docs/appengine_admin_v1/types.rst
index d2f435ce56ec..cc6979ecd33f 100644
--- a/packages/google-cloud-appengine-admin/docs/appengine_admin_v1/types.rst
+++ b/packages/google-cloud-appengine-admin/docs/appengine_admin_v1/types.rst
@@ -1,4 +1,4 @@
-Types for Google Cloud Appengine-admin v1 API
+Types for Google Cloud Appengine Admin v1 API
 =============================================
 
 .. automodule:: google.cloud.appengine_admin_v1.types
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/__init__.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/__init__.py
index a463e618d72b..e86b67ac4b10 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/__init__.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/__init__.py
@@ -130,6 +130,7 @@
     "ApiConfigHandler",
     "ApiEndpointHandler",
     "Application",
+    "ApplicationsClient",
     "AuditData",
     "AuthFailAction",
     "AuthorizedCertificate",
@@ -162,7 +163,6 @@
     "Deployment",
     "DiskUtilization",
     "DomainMapping",
-    "DomainMappingsClient",
     "DomainOverrideStrategy",
     "EndpointsApiService",
     "Entrypoint",
@@ -235,5 +235,5 @@
     "Volume",
     "VpcAccessConnector",
     "ZipInfo",
-    "ApplicationsClient",
+    "DomainMappingsClient",
 )
diff --git a/packages/google-cloud-appengine-admin/synth.metadata b/packages/google-cloud-appengine-admin/synth.metadata
new file mode 100644
index 000000000000..99013417ecf7
--- /dev/null
+++ b/packages/google-cloud-appengine-admin/synth.metadata
@@ -0,0 +1,221 @@
+{
+  "sources": [
+    {
+      "git": {
+        "name": ".",
+        "remote": "https://github.com/googleapis/python-appengine-admin.git",
+        "sha": "b23b075ae60fb5b7452e9c996b0febdeea81c50e"
+      }
+    },
+    {
+      "git": {
+        "name": "googleapis",
+        "remote": "https://github.com/googleapis/googleapis.git",
+        "sha": "7e91915c247a5c84ab5fcdf11ce2bdf7404f2fcc",
+        "internalRef": "367156876"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "705743e66f5c0b24a95f7f30619c9d3ef747b317"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "705743e66f5c0b24a95f7f30619c9d3ef747b317"
+      }
+    }
+  ],
+  "destinations": [
+    {
+      "client": {
+        "source": "googleapis",
+        "apiName": "appengine",
+        "apiVersion": "v1",
+        "language": "python",
+        "generator": "bazel"
+      }
+    }
+  ],
+  "generatedFiles": [
+    ".coveragerc",
+    ".flake8",
+    ".github/CONTRIBUTING.md",
+    ".github/ISSUE_TEMPLATE/bug_report.md",
+    ".github/ISSUE_TEMPLATE/feature_request.md",
+    ".github/ISSUE_TEMPLATE/support_request.md",
+    ".github/PULL_REQUEST_TEMPLATE.md",
+    ".github/header-checker-lint.yml",
+    ".github/release-please.yml",
+    ".github/snippet-bot.yml",
+    ".gitignore",
+    ".kokoro/build.sh",
+    ".kokoro/continuous/common.cfg",
+    ".kokoro/continuous/continuous.cfg",
+    ".kokoro/docker/docs/Dockerfile",
+    ".kokoro/docker/docs/fetch_gpg_keys.sh",
+    ".kokoro/docs/common.cfg",
+    ".kokoro/docs/docs-presubmit.cfg",
+    ".kokoro/docs/docs.cfg",
+    ".kokoro/populate-secrets.sh",
+    ".kokoro/presubmit/common.cfg",
+    ".kokoro/presubmit/presubmit.cfg",
+    ".kokoro/publish-docs.sh",
+    ".kokoro/release.sh",
+    ".kokoro/release/common.cfg",
+    ".kokoro/release/release.cfg",
+    ".kokoro/samples/lint/common.cfg",
+    ".kokoro/samples/lint/continuous.cfg",
+    ".kokoro/samples/lint/periodic.cfg",
+    ".kokoro/samples/lint/presubmit.cfg",
+    ".kokoro/samples/python3.6/common.cfg",
+    ".kokoro/samples/python3.6/continuous.cfg",
+    ".kokoro/samples/python3.6/periodic-head.cfg",
+    ".kokoro/samples/python3.6/periodic.cfg",
+    ".kokoro/samples/python3.6/presubmit.cfg",
+    ".kokoro/samples/python3.7/common.cfg",
+    ".kokoro/samples/python3.7/continuous.cfg",
+    ".kokoro/samples/python3.7/periodic-head.cfg",
+    ".kokoro/samples/python3.7/periodic.cfg",
+    ".kokoro/samples/python3.7/presubmit.cfg",
+    ".kokoro/samples/python3.8/common.cfg",
+    ".kokoro/samples/python3.8/continuous.cfg",
+    ".kokoro/samples/python3.8/periodic-head.cfg",
+    ".kokoro/samples/python3.8/periodic.cfg",
+    ".kokoro/samples/python3.8/presubmit.cfg",
+    ".kokoro/test-samples-against-head.sh",
+    ".kokoro/test-samples-impl.sh",
+    ".kokoro/test-samples.sh",
+    ".kokoro/trampoline.sh",
+    ".kokoro/trampoline_v2.sh",
+    ".pre-commit-config.yaml",
+    ".trampolinerc",
+    "CODE_OF_CONDUCT.md",
+    "CONTRIBUTING.rst",
+    "LICENSE",
+    "MANIFEST.in",
+    "docs/_static/custom.css",
+    "docs/_templates/layout.html",
+    "docs/appengine_admin_v1/applications.rst",
+    "docs/appengine_admin_v1/authorized_certificates.rst",
+    "docs/appengine_admin_v1/authorized_domains.rst",
+    "docs/appengine_admin_v1/domain_mappings.rst",
+    "docs/appengine_admin_v1/firewall.rst",
+    "docs/appengine_admin_v1/instances.rst",
+    "docs/appengine_admin_v1/types.rst",
+    "docs/appengine_admin_v1/versions.rst",
+    "docs/conf.py",
+    "docs/multiprocessing.rst",
+    "google/cloud/appengine_admin/__init__.py",
+    "google/cloud/appengine_admin/py.typed",
+    "google/cloud/appengine_admin_v1/__init__.py",
+    "google/cloud/appengine_admin_v1/py.typed",
+    "google/cloud/appengine_admin_v1/services/__init__.py",
+    "google/cloud/appengine_admin_v1/services/applications/__init__.py",
+    "google/cloud/appengine_admin_v1/services/applications/async_client.py",
+    "google/cloud/appengine_admin_v1/services/applications/client.py",
+    "google/cloud/appengine_admin_v1/services/applications/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/applications/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/applications/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/applications/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/__init__.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/async_client.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/client.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/pagers.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/__init__.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/async_client.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/client.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/pagers.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/__init__.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/async_client.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/client.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/pagers.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/firewall/__init__.py",
+    "google/cloud/appengine_admin_v1/services/firewall/async_client.py",
+    "google/cloud/appengine_admin_v1/services/firewall/client.py",
+    "google/cloud/appengine_admin_v1/services/firewall/pagers.py",
+    "google/cloud/appengine_admin_v1/services/firewall/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/firewall/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/firewall/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/firewall/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/instances/__init__.py",
+    "google/cloud/appengine_admin_v1/services/instances/async_client.py",
+    "google/cloud/appengine_admin_v1/services/instances/client.py",
+    "google/cloud/appengine_admin_v1/services/instances/pagers.py",
+    "google/cloud/appengine_admin_v1/services/instances/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/instances/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/instances/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/instances/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/services/__init__.py",
+    "google/cloud/appengine_admin_v1/services/services/async_client.py",
+    "google/cloud/appengine_admin_v1/services/services/client.py",
+    "google/cloud/appengine_admin_v1/services/services/pagers.py",
+    "google/cloud/appengine_admin_v1/services/services/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/services/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/services/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/services/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/services/versions/__init__.py",
+    "google/cloud/appengine_admin_v1/services/versions/async_client.py",
+    "google/cloud/appengine_admin_v1/services/versions/client.py",
+    "google/cloud/appengine_admin_v1/services/versions/pagers.py",
+    "google/cloud/appengine_admin_v1/services/versions/transports/__init__.py",
+    "google/cloud/appengine_admin_v1/services/versions/transports/base.py",
+    "google/cloud/appengine_admin_v1/services/versions/transports/grpc.py",
+    "google/cloud/appengine_admin_v1/services/versions/transports/grpc_asyncio.py",
+    "google/cloud/appengine_admin_v1/types/__init__.py",
+    "google/cloud/appengine_admin_v1/types/app_yaml.py",
+    "google/cloud/appengine_admin_v1/types/appengine.py",
+    "google/cloud/appengine_admin_v1/types/application.py",
+    "google/cloud/appengine_admin_v1/types/audit_data.py",
+    "google/cloud/appengine_admin_v1/types/certificate.py",
+    "google/cloud/appengine_admin_v1/types/deploy.py",
+    "google/cloud/appengine_admin_v1/types/deployed_files.py",
+    "google/cloud/appengine_admin_v1/types/domain.py",
+    "google/cloud/appengine_admin_v1/types/domain_mapping.py",
+    "google/cloud/appengine_admin_v1/types/firewall.py",
+    "google/cloud/appengine_admin_v1/types/instance.py",
+    "google/cloud/appengine_admin_v1/types/location.py",
+    "google/cloud/appengine_admin_v1/types/network_settings.py",
+    "google/cloud/appengine_admin_v1/types/operation.py",
+    "google/cloud/appengine_admin_v1/types/service.py",
+    "google/cloud/appengine_admin_v1/types/version.py",
+    "mypy.ini",
+    "noxfile.py",
+    "renovate.json",
+    "scripts/decrypt-secrets.sh",
+    "scripts/fixup_appengine_admin_v1_keywords.py",
+    "scripts/readme-gen/readme_gen.py",
+    "scripts/readme-gen/templates/README.tmpl.rst",
+    "scripts/readme-gen/templates/auth.tmpl.rst",
+    "scripts/readme-gen/templates/auth_api_key.tmpl.rst",
+    "scripts/readme-gen/templates/install_deps.tmpl.rst",
+    "scripts/readme-gen/templates/install_portaudio.tmpl.rst",
+    "setup.cfg",
+    "testing/.gitignore",
+    "tests/unit/gapic/appengine_admin_v1/__init__.py",
+    "tests/unit/gapic/appengine_admin_v1/test_applications.py",
+    "tests/unit/gapic/appengine_admin_v1/test_authorized_certificates.py",
+    "tests/unit/gapic/appengine_admin_v1/test_authorized_domains.py",
+    "tests/unit/gapic/appengine_admin_v1/test_domain_mappings.py",
+    "tests/unit/gapic/appengine_admin_v1/test_firewall.py",
+    "tests/unit/gapic/appengine_admin_v1/test_instances.py",
+    "tests/unit/gapic/appengine_admin_v1/test_services.py",
+    "tests/unit/gapic/appengine_admin_v1/test_versions.py"
+  ]
+}
\ No newline at end of file