diff --git a/.kokoro/common_env_vars.cfg b/.kokoro/common_env_vars.cfg
new file mode 100644
index 00000000..b5c22b80
--- /dev/null
+++ b/.kokoro/common_env_vars.cfg
@@ -0,0 +1,19 @@
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/continuous/common.cfg b/.kokoro/continuous/common.cfg
index ccbc23c7..c337b6d8 100644
--- a/.kokoro/continuous/common.cfg
+++ b/.kokoro/continuous/common.cfg
@@ -25,3 +25,23 @@ env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
     value: "github/python-error-reporting/.kokoro/build.sh"
 }
+
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/docs/common.cfg b/.kokoro/docs/common.cfg
index 2603e22d..eade26cf 100644
--- a/.kokoro/docs/common.cfg
+++ b/.kokoro/docs/common.cfg
@@ -63,4 +63,23 @@ before_action {
       keyname: "docuploader_service_account"
     }
   }
-}
\ No newline at end of file
+}
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/presubmit/common.cfg b/.kokoro/presubmit/common.cfg
index ccbc23c7..c337b6d8 100644
--- a/.kokoro/presubmit/common.cfg
+++ b/.kokoro/presubmit/common.cfg
@@ -25,3 +25,23 @@ env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
     value: "github/python-error-reporting/.kokoro/build.sh"
 }
+
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/release/common.cfg b/.kokoro/release/common.cfg
index c4f805b8..5e979115 100644
--- a/.kokoro/release/common.cfg
+++ b/.kokoro/release/common.cfg
@@ -38,3 +38,23 @@ env_vars: {
   key: "SECRET_MANAGER_KEYS"
   value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googleapis-installation,releasetool-publish-reporter-pem"
 }
+
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/samples/lint/common.cfg b/.kokoro/samples/lint/common.cfg
index a38013a4..3f98b562 100644
--- a/.kokoro/samples/lint/common.cfg
+++ b/.kokoro/samples/lint/common.cfg
@@ -31,4 +31,23 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
\ No newline at end of file
+build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/samples/python3.10/common.cfg b/.kokoro/samples/python3.10/common.cfg
index 2ed420e5..d19172ae 100644
--- a/.kokoro/samples/python3.10/common.cfg
+++ b/.kokoro/samples/python3.10/common.cfg
@@ -37,4 +37,23 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
\ No newline at end of file
+build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/samples/python3.7/common.cfg b/.kokoro/samples/python3.7/common.cfg
index 161c018b..ad162db9 100644
--- a/.kokoro/samples/python3.7/common.cfg
+++ b/.kokoro/samples/python3.7/common.cfg
@@ -37,4 +37,23 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
\ No newline at end of file
+build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/samples/python3.8/common.cfg b/.kokoro/samples/python3.8/common.cfg
index abd2a5bb..b495960b 100644
--- a/.kokoro/samples/python3.8/common.cfg
+++ b/.kokoro/samples/python3.8/common.cfg
@@ -37,4 +37,23 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
\ No newline at end of file
+build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/.kokoro/samples/python3.9/common.cfg b/.kokoro/samples/python3.9/common.cfg
index 4889669b..01a9e9d3 100644
--- a/.kokoro/samples/python3.9/common.cfg
+++ b/.kokoro/samples/python3.9/common.cfg
@@ -37,4 +37,23 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
\ No newline at end of file
+build_file: "python-error-reporting/.kokoro/trampoline_v2.sh"
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+
diff --git a/owlbot.py b/owlbot.py
index 5bc3f034..b192af9a 100644
--- a/owlbot.py
+++ b/owlbot.py
@@ -16,6 +16,7 @@
 import synthtool as s
 from synthtool import gcp
 from synthtool.languages import python
+import os
 
 common = gcp.CommonTemplates()
 
@@ -45,3 +46,20 @@
 
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)
 
+
+# --------------------------------------------------------------------------
+# Modify test configs
+# --------------------------------------------------------------------------
+
+# add shared environment variables to test configs
+tracked_subdirs = ["continuous", "presubmit", "release", "samples", "docs"]
+for subdir in tracked_subdirs:
+    for path, subdirs, files in os.walk(f".kokoro/{subdir}"):
+        for name in files:
+            if name == "common.cfg":
+                file_path = os.path.join(path, name)
+                s.move(
+                    ".kokoro/common_env_vars.cfg",
+                    file_path,
+                    merge=lambda src, dst, _, : f"{dst}\n{src}",
+                )