diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6ea8645a1..c2fc645d2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,8 +1,8 @@
-on:
+'on':
   push:
     branches:
-    - main
-  pull_request:
+      - 1.39.x
+  pull_request: null
 name: ci
 jobs:
   units:
@@ -10,55 +10,59 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17]
+        java:
+          - 8
+          - 11
+          - 17
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
-      with:
-        java-version: ${{matrix.java}}
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: test
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: ${{matrix.java}}
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: test
   dependencies:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17]
+        java:
+          - 8
+          - 11
+          - 17
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
-      with:
-        java-version: ${{matrix.java}}
-    - run: java -version
-    - run: .kokoro/dependencies.sh
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: ${{matrix.java}}
+      - run: java -version
+      - run: .kokoro/dependencies.sh
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
-      with:
-        java-version: 11
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: lint
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: lint
   clirr:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
-      with:
-        java-version: 8
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: clirr
-        
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: clirr
   units-java21:
-    # Building using Java 8 and run the tests with Java 21 runtime
-    name: "units (21)"
+    name: units (21)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -66,9 +70,9 @@ jobs:
         with:
           java-version: 21
           distribution: temurin
-      - name: "Set jvm system property environment variable for surefire plugin (unit tests)"
-        # Maven surefire plugin (unit tests) allows us to specify JVM to run the tests.
-        # https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#jvm
+      - name: >-
+          Set jvm system property environment variable for surefire plugin (unit
+          tests)
         run: echo "SUREFIRE_JVM_OPT=-Djvm=${JAVA_HOME}/bin/java" >> $GITHUB_ENV
         shell: bash
       - uses: actions/setup-java@v3
diff --git a/.github/workflows/downstream.yaml b/.github/workflows/downstream.yaml
index 59635c48a..3163f1f07 100644
--- a/.github/workflows/downstream.yaml
+++ b/.github/workflows/downstream.yaml
@@ -1,8 +1,9 @@
-on:
+'on':
   pull_request:
-    types: [ labeled ]
+    types:
+      - labeled
     branches:
-    - main
+      - 1.39.x
 name: downstream
 jobs:
   dependencies:
@@ -11,134 +12,136 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [17]
+        java:
+          - 17
         repo:
-        # This list needs to be updated manually until an automated solution is in place.
-        - accessapproval
-        - accesscontextmanager
-        - aiplatform
-        - analytics-admin
-        - analytics-data
-        - api-gateway
-        - apigee-connect
-        - appengine-admin
-        - area120-tables
-        - artifact-registry
-        - asset
-        - assured-workloads
-        - automl
-        - bigquery
-        - bigqueryconnection
-        - bigquerydatatransfer
-        - bigquerymigration
-        - bigqueryreservation
-        - bigtable
-        - billing
-        - billingbudgets
-        - binary-authorization
-        - channel
-        - cloudbuild
-        - compute
-        - contact-center-insights
-        - container
-        - containeranalysis
-        - data-fusion
-        - datacatalog
-        - dataflow
-        - datalabeling
-        - dataproc
-        - dataproc-metastore
-        - datastore
-        - datastream
-        - debugger-client
-        - deploy
-        - dialogflow
-        - dialogflow-cx
-        - dlp
-        - dms
-        - dns
-        - document-ai
-        - domains
-        - errorreporting
-        - essential-contacts
-        - eventarc
-        - filestore
-        - firestore
-        - functions
-        - game-servers
-        - gke-connect-gateway
-        - gkehub
-        - gsuite-addons
-        - iam-admin
-        - iamcredentials
-        - iot
-        - kms
-        - language
-        - life-sciences
-        - logging
-        - logging-logback
-        - managed-identities
-        - mediatranslation
-        - memcache
-        - monitoring
-        - monitoring-dashboards
-        - network-management
-        - network-security
-        - networkconnectivity
-        - notebooks
-        - orchestration-airflow
-        - orgpolicy
-        - os-config
-        - os-login
-        - phishingprotection
-        - policy-troubleshooter
-        - private-catalog
-        - profiler
-        - pubsublite
-        - recaptchaenterprise
-        - recommendations-ai
-        - recommender
-        - redis
-        - resource-settings
-        - resourcemanager
-        - retail
-        - scheduler
-        - secretmanager
-        - security-private-ca
-        - securitycenter
-        - securitycenter-settings
-        - service-control
-        - service-management
-        - service-usage
-        - servicedirectory
-        - shell
-        - spanner
-        - spanner-jdbc
-        - speech
-        - storage
-        - storage-nio
-        - storage-transfer
-        - talent
-        - tasks
-        - texttospeech
-        - tpu
-        - trace
-        - translate
-        - video-intelligence
-        - video-transcoder
-        - vision
-        - vpcaccess
-        - webrisk
-        - websecurityscanner
-        - workflow-executions
-        - workflows
+          - accessapproval
+          - accesscontextmanager
+          - aiplatform
+          - analytics-admin
+          - analytics-data
+          - api-gateway
+          - apigee-connect
+          - appengine-admin
+          - area120-tables
+          - artifact-registry
+          - asset
+          - assured-workloads
+          - automl
+          - bigquery
+          - bigqueryconnection
+          - bigquerydatatransfer
+          - bigquerymigration
+          - bigqueryreservation
+          - bigtable
+          - billing
+          - billingbudgets
+          - binary-authorization
+          - channel
+          - cloudbuild
+          - compute
+          - contact-center-insights
+          - container
+          - containeranalysis
+          - data-fusion
+          - datacatalog
+          - dataflow
+          - datalabeling
+          - dataproc
+          - dataproc-metastore
+          - datastore
+          - datastream
+          - debugger-client
+          - deploy
+          - dialogflow
+          - dialogflow-cx
+          - dlp
+          - dms
+          - dns
+          - document-ai
+          - domains
+          - errorreporting
+          - essential-contacts
+          - eventarc
+          - filestore
+          - firestore
+          - functions
+          - game-servers
+          - gke-connect-gateway
+          - gkehub
+          - gsuite-addons
+          - iam-admin
+          - iamcredentials
+          - iot
+          - kms
+          - language
+          - life-sciences
+          - logging
+          - logging-logback
+          - managed-identities
+          - mediatranslation
+          - memcache
+          - monitoring
+          - monitoring-dashboards
+          - network-management
+          - network-security
+          - networkconnectivity
+          - notebooks
+          - orchestration-airflow
+          - orgpolicy
+          - os-config
+          - os-login
+          - phishingprotection
+          - policy-troubleshooter
+          - private-catalog
+          - profiler
+          - pubsublite
+          - recaptchaenterprise
+          - recommendations-ai
+          - recommender
+          - redis
+          - resource-settings
+          - resourcemanager
+          - retail
+          - scheduler
+          - secretmanager
+          - security-private-ca
+          - securitycenter
+          - securitycenter-settings
+          - service-control
+          - service-management
+          - service-usage
+          - servicedirectory
+          - shell
+          - spanner
+          - spanner-jdbc
+          - speech
+          - storage
+          - storage-nio
+          - storage-transfer
+          - talent
+          - tasks
+          - texttospeech
+          - tpu
+          - trace
+          - translate
+          - video-intelligence
+          - video-transcoder
+          - vision
+          - vpcaccess
+          - webrisk
+          - websecurityscanner
+          - workflow-executions
+          - workflows
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v3
-      with:
-        distribution: zulu
-        java-version: ${{matrix.java}}
-    - run: java -version
-    - run: sudo apt-get update -y
-    - run: sudo apt-get install libxml2-utils
-    - run: .kokoro/downstream-client-library-check.sh google-oauth-client-bom ${{matrix.repo}}
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v3
+        with:
+          distribution: zulu
+          java-version: ${{matrix.java}}
+      - run: java -version
+      - run: sudo apt-get update -y
+      - run: sudo apt-get install libxml2-utils
+      - run: >-
+          .kokoro/downstream-client-library-check.sh google-oauth-client-bom
+          ${{matrix.repo}}