diff --git a/tools/internal_ci/linux/grpc_build_artifacts.sh b/tools/internal_ci/linux/grpc_build_artifacts.sh
index 0810790c37b..130c3492198 100755
--- a/tools/internal_ci/linux/grpc_build_artifacts.sh
+++ b/tools/internal_ci/linux/grpc_build_artifacts.sh
@@ -29,7 +29,7 @@ set -e  # rvm commands are very verbose
 rvm --default use ruby-2.4.1
 set -ex
 
-tools/run_tests/task_runner.py -f artifact linux -j 12 || FAILED="true"
+tools/run_tests/task_runner.py -f artifact linux ${TASK_RUNNER_EXTRA_FILTERS} -j 12 || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/linux/grpc_distribtests_php.sh b/tools/internal_ci/linux/grpc_distribtests_php.sh
index aad8d65b9bb..c2a5aa020da 100755
--- a/tools/internal_ci/linux/grpc_distribtests_php.sh
+++ b/tools/internal_ci/linux/grpc_distribtests_php.sh
@@ -24,7 +24,7 @@ cd $(dirname $0)/../../..
 source tools/internal_ci/helper_scripts/prepare_build_linux_rc
 
 # Build all PHP linux artifacts
-tools/run_tests/task_runner.py -f artifact linux php -j 4 -x build_artifacts/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f artifact linux php ${TASK_RUNNER_EXTRA_FILTERS} -j 4 -x build_artifacts/sponge_log.xml || FAILED="true"
 
 # the next step expects to find the artifacts from the previous step in the "input_artifacts" folder.
 rm -rf input_artifacts
@@ -46,7 +46,7 @@ cp -r artifacts/* input_artifacts/ || true
 # Run all PHP linux distribtests
 # We run the distribtests even if some of the artifacts have failed to build, since that gives
 # a better signal about which distribtest are affected by the currently broken artifact builds.
-tools/run_tests/task_runner.py -f distribtest linux php -j 4 -x distribtests/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f distribtest linux php ${TASK_RUNNER_EXTRA_FILTERS} -j 4 -x distribtests/sponge_log.xml || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/linux/grpc_distribtests_python.sh b/tools/internal_ci/linux/grpc_distribtests_python.sh
index a03309231d5..874e978dfb0 100755
--- a/tools/internal_ci/linux/grpc_distribtests_python.sh
+++ b/tools/internal_ci/linux/grpc_distribtests_python.sh
@@ -29,7 +29,7 @@ source tools/internal_ci/helper_scripts/prepare_build_linux_rc
 source tools/internal_ci/helper_scripts/prepare_qemu_rc
 
 # Build all python linux artifacts (this step actually builds all the binary wheels and source archives)
-tools/run_tests/task_runner.py -f artifact linux python -j 12 -x build_artifacts/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f artifact linux python ${TASK_RUNNER_EXTRA_FILTERS} -j 12 -x build_artifacts/sponge_log.xml || FAILED="true"
 
 # the next step expects to find the artifacts from the previous step in the "input_artifacts" folder.
 rm -rf input_artifacts
@@ -51,7 +51,7 @@ cp -r artifacts/* input_artifacts/ || true
 # Run all python linux distribtests
 # We run the distribtests even if some of the artifacts have failed to build, since that gives
 # a better signal about which distribtest are affected by the currently broken artifact builds.
-tools/run_tests/task_runner.py -f distribtest linux python -j 12 -x distribtests/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f distribtest linux python ${TASK_RUNNER_EXTRA_FILTERS} -j 12 -x distribtests/sponge_log.xml || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/linux/grpc_distribtests_ruby.sh b/tools/internal_ci/linux/grpc_distribtests_ruby.sh
index 3da15534b8a..0d848617781 100755
--- a/tools/internal_ci/linux/grpc_distribtests_ruby.sh
+++ b/tools/internal_ci/linux/grpc_distribtests_ruby.sh
@@ -30,7 +30,7 @@ rvm --default use ruby-2.4.1
 set -ex
 
 # Build all ruby linux artifacts (this step actually builds all the binary wheels and source archives)
-tools/run_tests/task_runner.py -f artifact linux ruby -j 6 -x build_artifacts/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f artifact linux ruby ${TASK_RUNNER_EXTRA_FILTERS} -j 6 -x build_artifacts/sponge_log.xml || FAILED="true"
 
 # Ruby "build_package" step is basically just a passthough for the "grpc" gems, so it's enough to just
 # copy the native gems directly to the "distribtests" step and skip the "build_package" phase entirely.
@@ -47,7 +47,7 @@ cp -r artifacts/ruby_native_gem_*/* input_artifacts/ || true
 # Run all ruby linux distribtests
 # We run the distribtests even if some of the artifacts have failed to build, since that gives
 # a better signal about which distribtest are affected by the currently broken artifact builds.
-tools/run_tests/task_runner.py -f distribtest linux ruby -j 6 -x distribtests/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f distribtest linux ruby ${TASK_RUNNER_EXTRA_FILTERS} -j 6 -x distribtests/sponge_log.xml || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/linux/grpc_distribtests_standalone.sh b/tools/internal_ci/linux/grpc_distribtests_standalone.sh
index f71f3b13773..dd854400c98 100755
--- a/tools/internal_ci/linux/grpc_distribtests_standalone.sh
+++ b/tools/internal_ci/linux/grpc_distribtests_standalone.sh
@@ -23,4 +23,4 @@ cd $(dirname $0)/../../..
 
 source tools/internal_ci/helper_scripts/prepare_build_linux_rc
 
-tools/run_tests/task_runner.py -f distribtest linux cpp -j 6
+tools/run_tests/task_runner.py -f distribtest linux cpp ${TASK_RUNNER_EXTRA_FILTERS} -j 6
diff --git a/tools/internal_ci/linux/pull_request/grpc_build_artifacts.cfg b/tools/internal_ci/linux/pull_request/grpc_build_artifacts.cfg
new file mode 100644
index 00000000000..8fcc5e77567
--- /dev/null
+++ b/tools/internal_ci/linux/pull_request/grpc_build_artifacts.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_build_artifacts.sh"
+timeout_mins: 180
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/linux/pull_request/grpc_distribtests_php.cfg b/tools/internal_ci/linux/pull_request/grpc_distribtests_php.cfg
new file mode 100644
index 00000000000..cc5f4f74e95
--- /dev/null
+++ b/tools/internal_ci/linux/pull_request/grpc_distribtests_php.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_distribtests_php.sh"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/linux/pull_request/grpc_distribtests_python.cfg b/tools/internal_ci/linux/pull_request/grpc_distribtests_python.cfg
new file mode 100644
index 00000000000..de62ae1c80b
--- /dev/null
+++ b/tools/internal_ci/linux/pull_request/grpc_distribtests_python.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_distribtests_python.sh"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/linux/pull_request/grpc_distribtests_ruby.cfg b/tools/internal_ci/linux/pull_request/grpc_distribtests_ruby.cfg
new file mode 100644
index 00000000000..3963c5b5287
--- /dev/null
+++ b/tools/internal_ci/linux/pull_request/grpc_distribtests_ruby.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_distribtests_ruby.sh"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/linux/pull_request/grpc_distribtests_standalone.cfg b/tools/internal_ci/linux/pull_request/grpc_distribtests_standalone.cfg
new file mode 100644
index 00000000000..b7e27a97841
--- /dev/null
+++ b/tools/internal_ci/linux/pull_request/grpc_distribtests_standalone.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_distribtests_standalone.sh"
+timeout_mins: 120
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/macos/grpc_build_artifacts.sh b/tools/internal_ci/macos/grpc_build_artifacts.sh
index 2e4522a6f91..e6941bd14fe 100755
--- a/tools/internal_ci/macos/grpc_build_artifacts.sh
+++ b/tools/internal_ci/macos/grpc_build_artifacts.sh
@@ -41,7 +41,7 @@ time bash tools/distrib/build_ruby_environment_macos.sh
 gem install rubygems-update
 update_rubygems
 
-tools/run_tests/task_runner.py -f artifact macos || FAILED="true"
+tools/run_tests/task_runner.py -f artifact macos ${TASK_RUNNER_EXTRA_FILTERS} || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/macos/grpc_distribtests_php.sh b/tools/internal_ci/macos/grpc_distribtests_php.sh
index 5bd716c32fc..5ae1ba1ab3c 100644
--- a/tools/internal_ci/macos/grpc_distribtests_php.sh
+++ b/tools/internal_ci/macos/grpc_distribtests_php.sh
@@ -25,7 +25,7 @@ export PREPARE_BUILD_INSTALL_DEPS_PHP=true
 source tools/internal_ci/helper_scripts/prepare_build_macos_rc
 
 # Build all PHP macos artifacts
-tools/run_tests/task_runner.py -f artifact macos php -j 4 -x build_artifacts/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f artifact macos php ${TASK_RUNNER_EXTRA_FILTERS} -j 4 -x build_artifacts/sponge_log.xml || FAILED="true"
 
 # PHP's "build_package" step is basically just a passthough, so the build artifacts can be used
 # directly by the "distribtests" step (and we skip the "build_package" phase entirely on mac).
@@ -40,7 +40,7 @@ cp -r artifacts/php_pecl_package_macos_*/* input_artifacts/ || true
 # Run all PHP linux distribtests
 # We run the distribtests even if some of the artifacts have failed to build, since that gives
 # a better signal about which distribtest are affected by the currently broken artifact builds.
-tools/run_tests/task_runner.py -f distribtest macos php -j 4 -x distribtests/sponge_log.xml || FAILED="true"
+tools/run_tests/task_runner.py -f distribtest macos php ${TASK_RUNNER_EXTRA_FILTERS} -j 4 -x distribtests/sponge_log.xml || FAILED="true"
 
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
diff --git a/tools/internal_ci/macos/pull_request/grpc_build_artifacts.cfg b/tools/internal_ci/macos/pull_request/grpc_build_artifacts.cfg
new file mode 100644
index 00000000000..ee61cd24a4f
--- /dev/null
+++ b/tools/internal_ci/macos/pull_request/grpc_build_artifacts.cfg
@@ -0,0 +1,32 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/macos/grpc_build_artifacts.sh"
+gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/macos/pull_request/grpc_distribtests_php.cfg b/tools/internal_ci/macos/pull_request/grpc_distribtests_php.cfg
new file mode 100644
index 00000000000..192ab8271d7
--- /dev/null
+++ b/tools/internal_ci/macos/pull_request/grpc_distribtests_php.cfg
@@ -0,0 +1,32 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/macos/grpc_distribtests_php.sh"
+gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/windows/grpc_build_artifacts.bat b/tools/internal_ci/windows/grpc_build_artifacts.bat
index 72813bd4b59..10c52cfd9fa 100644
--- a/tools/internal_ci/windows/grpc_build_artifacts.bat
+++ b/tools/internal_ci/windows/grpc_build_artifacts.bat
@@ -29,7 +29,7 @@ cd /d %~dp0\..\..\..
 set PREPARE_BUILD_INSTALL_DEPS_PYTHON=true
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
-python tools/run_tests/task_runner.py -f artifact windows -j 4
+python tools/run_tests/task_runner.py -f artifact windows %TASK_RUNNER_EXTRA_FILTERS% -j 4
 set RUNTESTS_EXITCODE=%errorlevel%
 
 bash tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
diff --git a/tools/internal_ci/windows/grpc_distribtests_standalone.bat b/tools/internal_ci/windows/grpc_distribtests_standalone.bat
index 1d0635723f3..184c7b808f9 100644
--- a/tools/internal_ci/windows/grpc_distribtests_standalone.bat
+++ b/tools/internal_ci/windows/grpc_distribtests_standalone.bat
@@ -24,7 +24,7 @@ cd /d %~dp0\..\..\..
 
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
-python tools/run_tests/task_runner.py -f distribtest windows cpp -j 4
+python tools/run_tests/task_runner.py -f distribtest windows cpp %TASK_RUNNER_EXTRA_FILTERS% -j 4
 set RUNTESTS_EXITCODE=%errorlevel%
 
 exit /b %RUNTESTS_EXITCODE%
diff --git a/tools/internal_ci/windows/pull_request/grpc_build_artifacts.cfg b/tools/internal_ci/windows/pull_request/grpc_build_artifacts.cfg
new file mode 100644
index 00000000000..244437a268b
--- /dev/null
+++ b/tools/internal_ci/windows/pull_request/grpc_build_artifacts.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/windows/grpc_build_artifacts.bat"
+timeout_mins: 240
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/internal_ci/windows/pull_request/grpc_distribtests_standalone.cfg b/tools/internal_ci/windows/pull_request/grpc_distribtests_standalone.cfg
new file mode 100644
index 00000000000..b673e13ba11
--- /dev/null
+++ b/tools/internal_ci/windows/pull_request/grpc_distribtests_standalone.cfg
@@ -0,0 +1,31 @@
+# Copyright 2021 The gRPC Authors
+#
+# 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.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/windows/grpc_distribtests_standalone.bat"
+timeout_mins: 120
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.*"
+    regex: "github/grpc/reports/**"
+    regex: "github/grpc/artifacts/**"
+  }
+}
+
+env_vars {
+  key: "TASK_RUNNER_EXTRA_FILTERS"
+  value: "presubmit"
+}
diff --git a/tools/run_tests/artifacts/artifact_targets.py b/tools/run_tests/artifacts/artifact_targets.py
index 1932b46f0ce..86755f2ed95 100644
--- a/tools/run_tests/artifacts/artifact_targets.py
+++ b/tools/run_tests/artifacts/artifact_targets.py
@@ -99,11 +99,13 @@ _ARCH_FLAG_MAP = {'x86': '-m32', 'x64': '-m64'}
 class PythonArtifact:
     """Builds Python artifacts."""
 
-    def __init__(self, platform, arch, py_version):
+    def __init__(self, platform, arch, py_version, presubmit=False):
         self.name = 'python_%s_%s_%s' % (platform, arch, py_version)
         self.platform = platform
         self.arch = arch
         self.labels = ['artifact', 'python', platform, arch, py_version]
+        if presubmit:
+            self.labels.append('presubmit')
         self.py_version = py_version
         if 'manylinux' in platform:
             self.labels.append('linux')
@@ -191,11 +193,13 @@ class PythonArtifact:
 class RubyArtifact:
     """Builds ruby native gem."""
 
-    def __init__(self, platform, arch):
+    def __init__(self, platform, arch, presubmit=False):
         self.name = 'ruby_native_gem_%s_%s' % (platform, arch)
         self.platform = platform
         self.arch = arch
         self.labels = ['artifact', 'ruby', platform, arch]
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -212,7 +216,7 @@ class RubyArtifact:
 class CSharpExtArtifact:
     """Builds C# native extension library"""
 
-    def __init__(self, platform, arch, arch_abi=None):
+    def __init__(self, platform, arch, arch_abi=None, presubmit=False):
         self.name = 'csharp_ext_%s_%s' % (platform, arch)
         self.platform = platform
         self.arch = arch
@@ -221,6 +225,8 @@ class CSharpExtArtifact:
         if arch_abi:
             self.name += '_%s' % arch_abi
             self.labels.append(arch_abi)
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -270,11 +276,13 @@ class CSharpExtArtifact:
 class PHPArtifact:
     """Builds PHP PECL package"""
 
-    def __init__(self, platform, arch):
+    def __init__(self, platform, arch, presubmit=False):
         self.name = 'php_pecl_package_{0}_{1}'.format(platform, arch)
         self.platform = platform
         self.arch = arch
         self.labels = ['artifact', 'php', platform, arch]
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -294,11 +302,13 @@ class PHPArtifact:
 class ProtocArtifact:
     """Builds protoc and protoc-plugin artifacts"""
 
-    def __init__(self, platform, arch):
+    def __init__(self, platform, arch, presubmit=False):
         self.name = 'protoc_%s_%s' % (platform, arch)
         self.platform = platform
         self.arch = arch
         self.labels = ['artifact', 'protoc', platform, arch]
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -343,66 +353,73 @@ class ProtocArtifact:
 def targets():
     """Gets list of supported targets"""
     return [
-        ProtocArtifact('linux', 'x64'),
-        ProtocArtifact('linux', 'x86'),
-        ProtocArtifact('linux', 'aarch64'),
-        ProtocArtifact('macos', 'x64'),
-        ProtocArtifact('windows', 'x64'),
-        ProtocArtifact('windows', 'x86'),
-        CSharpExtArtifact('linux', 'x64'),
-        CSharpExtArtifact('linux', 'aarch64'),
-        CSharpExtArtifact('macos', 'x64'),
-        CSharpExtArtifact('windows', 'x64'),
-        CSharpExtArtifact('windows', 'x86'),
-        CSharpExtArtifact('linux', 'android', arch_abi='arm64-v8a'),
-        CSharpExtArtifact('linux', 'android', arch_abi='armeabi-v7a'),
-        CSharpExtArtifact('linux', 'android', arch_abi='x86'),
-        CSharpExtArtifact('macos', 'ios'),
-        PythonArtifact('manylinux2014', 'x64', 'cp36-cp36m'),
+        ProtocArtifact('linux', 'x64', presubmit=True),
+        ProtocArtifact('linux', 'x86', presubmit=True),
+        ProtocArtifact('linux', 'aarch64', presubmit=True),
+        ProtocArtifact('macos', 'x64', presubmit=True),
+        ProtocArtifact('windows', 'x64', presubmit=True),
+        ProtocArtifact('windows', 'x86', presubmit=True),
+        CSharpExtArtifact('linux', 'x64', presubmit=True),
+        CSharpExtArtifact('linux', 'aarch64', presubmit=True),
+        CSharpExtArtifact('macos', 'x64', presubmit=True),
+        CSharpExtArtifact('windows', 'x64', presubmit=True),
+        CSharpExtArtifact('windows', 'x86', presubmit=True),
+        CSharpExtArtifact('linux',
+                          'android',
+                          arch_abi='arm64-v8a',
+                          presubmit=True),
+        CSharpExtArtifact('linux',
+                          'android',
+                          arch_abi='armeabi-v7a',
+                          presubmit=True),
+        CSharpExtArtifact('linux', 'android', arch_abi='x86', presubmit=True),
+        CSharpExtArtifact('macos', 'ios', presubmit=True),
+        PythonArtifact('manylinux2014', 'x64', 'cp36-cp36m', presubmit=True),
         PythonArtifact('manylinux2014', 'x64', 'cp37-cp37m'),
         PythonArtifact('manylinux2014', 'x64', 'cp38-cp38'),
         PythonArtifact('manylinux2014', 'x64', 'cp39-cp39'),
-        PythonArtifact('manylinux2014', 'x64', 'cp310-cp310'),
-        PythonArtifact('manylinux2014', 'x86', 'cp36-cp36m'),
+        PythonArtifact('manylinux2014', 'x64', 'cp310-cp310', presubmit=True),
+        PythonArtifact('manylinux2014', 'x86', 'cp36-cp36m', presubmit=True),
         PythonArtifact('manylinux2014', 'x86', 'cp37-cp37m'),
         PythonArtifact('manylinux2014', 'x86', 'cp38-cp38'),
         PythonArtifact('manylinux2014', 'x86', 'cp39-cp39'),
-        PythonArtifact('manylinux2014', 'x86', 'cp310-cp310'),
+        PythonArtifact('manylinux2014', 'x86', 'cp310-cp310', presubmit=True),
         PythonArtifact('manylinux2010', 'x64', 'cp36-cp36m'),
-        PythonArtifact('manylinux2010', 'x64', 'cp37-cp37m'),
+        PythonArtifact('manylinux2010', 'x64', 'cp37-cp37m', presubmit=True),
         PythonArtifact('manylinux2010', 'x64', 'cp38-cp38'),
         PythonArtifact('manylinux2010', 'x64', 'cp39-cp39'),
         PythonArtifact('manylinux2010', 'x86', 'cp36-cp36m'),
-        PythonArtifact('manylinux2010', 'x86', 'cp37-cp37m'),
+        PythonArtifact('manylinux2010', 'x86', 'cp37-cp37m', presubmit=True),
         PythonArtifact('manylinux2010', 'x86', 'cp38-cp38'),
         PythonArtifact('manylinux2010', 'x86', 'cp39-cp39'),
-        PythonArtifact('manylinux2014', 'aarch64', 'cp36-cp36m'),
+        PythonArtifact('manylinux2014', 'aarch64', 'cp36-cp36m',
+                       presubmit=True),
         PythonArtifact('manylinux2014', 'aarch64', 'cp37-cp37m'),
-        PythonArtifact('manylinux2014', 'aarch64', 'cp38-cp38'),
+        PythonArtifact('manylinux2014', 'aarch64', 'cp38-cp38', presubmit=True),
         PythonArtifact('manylinux2014', 'aarch64', 'cp39-cp39'),
         PythonArtifact('manylinux2014', 'aarch64', 'cp310-cp310'),
-        PythonArtifact('linux_extra', 'armv7', 'cp36-cp36m'),
+        PythonArtifact('linux_extra', 'armv7', 'cp36-cp36m', presubmit=True),
         PythonArtifact('linux_extra', 'armv7', 'cp37-cp37m'),
         PythonArtifact('linux_extra', 'armv7', 'cp38-cp38'),
         PythonArtifact('linux_extra', 'armv7', 'cp39-cp39'),
-        PythonArtifact('linux_extra', 'armv7', 'cp310-cp310'),
-        PythonArtifact('macos', 'x64', 'python3.6'),
+        PythonArtifact('linux_extra', 'armv7', 'cp310-cp310', presubmit=True),
+        PythonArtifact('macos', 'x64', 'python3.6', presubmit=True),
         PythonArtifact('macos', 'x64', 'python3.7'),
         PythonArtifact('macos', 'x64', 'python3.8'),
         PythonArtifact('macos', 'x64', 'python3.9'),
-        PythonArtifact('macos', 'x64', 'python3.10'),
-        PythonArtifact('windows', 'x86', 'Python36_32bit'),
+        PythonArtifact('macos', 'x64', 'python3.10', presubmit=True),
+        PythonArtifact('windows', 'x86', 'Python36_32bit', presubmit=True),
         PythonArtifact('windows', 'x86', 'Python37_32bit'),
         PythonArtifact('windows', 'x86', 'Python38_32bit'),
         PythonArtifact('windows', 'x86', 'Python39_32bit'),
-        PythonArtifact('windows', 'x86', 'Python310_32bit'),
-        PythonArtifact('windows', 'x64', 'Python36'),
+        PythonArtifact('windows', 'x86', 'Python310_32bit', presubmit=True),
+        PythonArtifact('windows', 'x64', 'Python36', presubmit=True),
         PythonArtifact('windows', 'x64', 'Python37'),
         PythonArtifact('windows', 'x64', 'Python38'),
         PythonArtifact('windows', 'x64', 'Python39'),
-        PythonArtifact('windows', 'x64', 'Python310'),
-        RubyArtifact('linux', 'x64'),
-        RubyArtifact('macos', 'x64'),
-        PHPArtifact('linux', 'x64'),
-        PHPArtifact('macos', 'x64')
+        PythonArtifact('windows', 'x64', 'Python310', presubmit=True),
+        RubyArtifact('linux', 'x64', presubmit=True),
+        RubyArtifact('macos', 'x64', presubmit=True),
+        PHPArtifact('linux', 'x64', presubmit=True),
+        PHPArtifact('macos', 'x64', presubmit=True)
     ]
diff --git a/tools/run_tests/artifacts/distribtest_targets.py b/tools/run_tests/artifacts/distribtest_targets.py
index ab3fc1fe5f6..fed41dd77c2 100644
--- a/tools/run_tests/artifacts/distribtest_targets.py
+++ b/tools/run_tests/artifacts/distribtest_targets.py
@@ -85,12 +85,15 @@ class CSharpDistribTest(object):
                  platform,
                  arch,
                  docker_suffix=None,
-                 use_dotnet_cli=False):
+                 use_dotnet_cli=False,
+                 presubmit=False):
         self.name = 'csharp_%s_%s' % (platform, arch)
         self.platform = platform
         self.arch = arch
         self.docker_suffix = docker_suffix
         self.labels = ['distribtest', 'csharp', platform, arch]
+        if presubmit:
+            self.labels.append('presubmit')
         self.script_suffix = ''
         if docker_suffix:
             self.name += '_%s' % docker_suffix
@@ -146,7 +149,12 @@ class CSharpDistribTest(object):
 class PythonDistribTest(object):
     """Tests Python package"""
 
-    def __init__(self, platform, arch, docker_suffix, source=False):
+    def __init__(self,
+                 platform,
+                 arch,
+                 docker_suffix,
+                 source=False,
+                 presubmit=False):
         self.source = source
         if source:
             self.name = 'python_dev_%s_%s_%s' % (platform, arch, docker_suffix)
@@ -156,6 +164,8 @@ class PythonDistribTest(object):
         self.arch = arch
         self.docker_suffix = docker_suffix
         self.labels = ['distribtest', 'python', platform, arch, docker_suffix]
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -191,7 +201,8 @@ class RubyDistribTest(object):
                  arch,
                  docker_suffix,
                  ruby_version=None,
-                 source=False):
+                 source=False,
+                 presubmit=False):
         self.package_type = 'binary'
         if source:
             self.package_type = 'source'
@@ -203,6 +214,8 @@ class RubyDistribTest(object):
         self.docker_suffix = docker_suffix
         self.ruby_version = ruby_version
         self.labels = ['distribtest', 'ruby', platform, arch, docker_suffix]
+        if presubmit:
+            self.labels.append('presubmit')
 
     def pre_build_jobspecs(self):
         return []
@@ -233,12 +246,14 @@ class RubyDistribTest(object):
 class PHP7DistribTest(object):
     """Tests PHP7 package"""
 
-    def __init__(self, platform, arch, docker_suffix=None):
+    def __init__(self, platform, arch, docker_suffix=None, presubmit=False):
         self.name = 'php7_%s_%s_%s' % (platform, arch, docker_suffix)
         self.platform = platform
         self.arch = arch
         self.docker_suffix = docker_suffix
         self.labels = ['distribtest', 'php', 'php7', platform, arch]
+        if presubmit:
+            self.labels.append('presubmit')
         if docker_suffix:
             self.labels.append(docker_suffix)
 
@@ -269,7 +284,12 @@ class PHP7DistribTest(object):
 class CppDistribTest(object):
     """Tests Cpp make install by building examples."""
 
-    def __init__(self, platform, arch, docker_suffix=None, testcase=None):
+    def __init__(self,
+                 platform,
+                 arch,
+                 docker_suffix=None,
+                 testcase=None,
+                 presubmit=False):
         if platform == 'linux':
             self.name = 'cpp_%s_%s_%s_%s' % (platform, arch, docker_suffix,
                                              testcase)
@@ -286,6 +306,8 @@ class CppDistribTest(object):
             arch,
             testcase,
         ]
+        if presubmit:
+            self.labels.append('presubmit')
         if docker_suffix:
             self.labels.append(docker_suffix)
 
@@ -318,64 +340,125 @@ def targets():
     """Gets list of supported targets"""
     return [
         # C++
-        CppDistribTest('linux', 'x64', 'jessie', 'cmake_as_submodule'),
-        CppDistribTest('linux', 'x64', 'stretch', 'cmake'),
-        CppDistribTest('linux', 'x64', 'stretch', 'cmake_as_externalproject'),
-        CppDistribTest('linux', 'x64', 'stretch', 'cmake_fetchcontent'),
-        CppDistribTest('linux', 'x64', 'stretch', 'cmake_module_install'),
-        CppDistribTest('linux', 'x64', 'stretch',
-                       'cmake_module_install_pkgconfig'),
-        CppDistribTest('linux', 'x64', 'stretch', 'cmake_pkgconfig'),
-        CppDistribTest('linux', 'x64', 'stretch_aarch64_cross',
-                       'cmake_aarch64_cross'),
-        CppDistribTest('windows', 'x86', testcase='cmake'),
-        CppDistribTest('windows', 'x86', testcase='cmake_as_externalproject'),
+        CppDistribTest('linux',
+                       'x64',
+                       'jessie',
+                       'cmake_as_submodule',
+                       presubmit=True),
+        CppDistribTest('linux', 'x64', 'stretch', 'cmake', presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch',
+                       'cmake_as_externalproject',
+                       presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch',
+                       'cmake_fetchcontent',
+                       presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch',
+                       'cmake_module_install',
+                       presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch',
+                       'cmake_module_install_pkgconfig',
+                       presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch',
+                       'cmake_pkgconfig',
+                       presubmit=True),
+        CppDistribTest('linux',
+                       'x64',
+                       'stretch_aarch64_cross',
+                       'cmake_aarch64_cross',
+                       presubmit=True),
+        CppDistribTest('windows', 'x86', testcase='cmake', presubmit=True),
+        CppDistribTest('windows',
+                       'x86',
+                       testcase='cmake_as_externalproject',
+                       presubmit=True),
         # C#
-        CSharpDistribTest('linux', 'x64', 'jessie'),
+        CSharpDistribTest('linux', 'x64', 'jessie', presubmit=True),
         CSharpDistribTest('linux', 'x64', 'stretch'),
-        CSharpDistribTest('linux', 'x64', 'stretch', use_dotnet_cli=True),
+        CSharpDistribTest('linux',
+                          'x64',
+                          'stretch',
+                          use_dotnet_cli=True,
+                          presubmit=True),
         CSharpDistribTest('linux', 'x64', 'centos7'),
         CSharpDistribTest('linux', 'x64', 'ubuntu1604'),
         CSharpDistribTest('linux', 'x64', 'ubuntu1604', use_dotnet_cli=True),
-        CSharpDistribTest('linux', 'x64', 'alpine', use_dotnet_cli=True),
-        CSharpDistribTest('linux', 'x64', 'dotnet31', use_dotnet_cli=True),
-        CSharpDistribTest('linux', 'x64', 'dotnet5', use_dotnet_cli=True),
-        CSharpDistribTest('macos', 'x64'),
-        CSharpDistribTest('windows', 'x86'),
-        CSharpDistribTest('windows', 'x64'),
+        CSharpDistribTest('linux',
+                          'x64',
+                          'alpine',
+                          use_dotnet_cli=True,
+                          presubmit=True),
+        CSharpDistribTest('linux',
+                          'x64',
+                          'dotnet31',
+                          use_dotnet_cli=True,
+                          presubmit=True),
+        CSharpDistribTest('linux',
+                          'x64',
+                          'dotnet5',
+                          use_dotnet_cli=True,
+                          presubmit=True),
+        CSharpDistribTest('macos', 'x64', presubmit=True),
+        CSharpDistribTest('windows', 'x86', presubmit=True),
+        CSharpDistribTest('windows', 'x64', presubmit=True),
         # Python
-        PythonDistribTest('linux', 'x64', 'buster'),
-        PythonDistribTest('linux', 'x86', 'buster'),
+        PythonDistribTest('linux', 'x64', 'buster', presubmit=True),
+        PythonDistribTest('linux', 'x86', 'buster', presubmit=True),
         PythonDistribTest('linux', 'x64', 'centos7'),
         PythonDistribTest('linux', 'x64', 'fedora34'),
         PythonDistribTest('linux', 'x64', 'opensuse'),
         PythonDistribTest('linux', 'x64', 'arch'),
         PythonDistribTest('linux', 'x64', 'ubuntu1804'),
-        PythonDistribTest('linux', 'aarch64', 'python38_buster'),
-        PythonDistribTest('linux', 'x64', 'alpine3.7', source=True),
-        PythonDistribTest('linux', 'x64', 'buster', source=True),
-        PythonDistribTest('linux', 'x86', 'buster', source=True),
+        PythonDistribTest('linux', 'aarch64', 'python38_buster',
+                          presubmit=True),
+        PythonDistribTest('linux',
+                          'x64',
+                          'alpine3.7',
+                          source=True,
+                          presubmit=True),
+        PythonDistribTest('linux', 'x64', 'buster', source=True,
+                          presubmit=True),
+        PythonDistribTest('linux', 'x86', 'buster', source=True,
+                          presubmit=True),
         PythonDistribTest('linux', 'x64', 'centos7', source=True),
         PythonDistribTest('linux', 'x64', 'fedora34', source=True),
         PythonDistribTest('linux', 'x64', 'arch', source=True),
         PythonDistribTest('linux', 'x64', 'ubuntu1804', source=True),
         # Ruby
-        RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_4'),
+        RubyDistribTest('linux',
+                        'x64',
+                        'jessie',
+                        ruby_version='ruby_2_4',
+                        presubmit=True),
         RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_5'),
         RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_6'),
-        RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_7'),
+        RubyDistribTest('linux',
+                        'x64',
+                        'jessie',
+                        ruby_version='ruby_2_7',
+                        presubmit=True),
         # TODO(apolcyn): add a ruby 3.0 test once protobuf adds support
         RubyDistribTest('linux',
                         'x64',
                         'jessie',
                         ruby_version='ruby_2_4',
-                        source=True),
+                        source=True,
+                        presubmit=True),
         RubyDistribTest('linux', 'x64', 'centos7'),
         RubyDistribTest('linux', 'x64', 'fedora23'),
         RubyDistribTest('linux', 'x64', 'opensuse'),
         RubyDistribTest('linux', 'x64', 'ubuntu1604'),
-        RubyDistribTest('linux', 'x64', 'ubuntu1804'),
+        RubyDistribTest('linux', 'x64', 'ubuntu1804', presubmit=True),
         # PHP7
-        PHP7DistribTest('linux', 'x64', 'stretch'),
-        PHP7DistribTest('macos', 'x64'),
+        PHP7DistribTest('linux', 'x64', 'stretch', presubmit=True),
+        PHP7DistribTest('macos', 'x64', presubmit=True),
     ]