diff --git a/packages/google-cloud-monitoring/.github/header-checker-lint.yml b/packages/google-cloud-monitoring/.github/header-checker-lint.yml
new file mode 100644
index 000000000000..fc281c05bd55
--- /dev/null
+++ b/packages/google-cloud-monitoring/.github/header-checker-lint.yml
@@ -0,0 +1,15 @@
+{"allowedCopyrightHolders": ["Google LLC"],
+ "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt"],
+ "sourceFileExtensions": [
+ 	"ts", 
+ 	"js", 
+ 	"java", 
+ 	"sh", 
+ 	"Dockerfile", 
+ 	"yaml", 
+ 	"py",
+ 	"html",
+ 	"txt"
+ ]
+}
\ No newline at end of file
diff --git a/packages/google-cloud-monitoring/.gitignore b/packages/google-cloud-monitoring/.gitignore
index b9daa52f118d..b4243ced74e4 100644
--- a/packages/google-cloud-monitoring/.gitignore
+++ b/packages/google-cloud-monitoring/.gitignore
@@ -50,8 +50,10 @@ docs.metadata
 
 # Virtual environment
 env/
+
+# Test logs
 coverage.xml
-sponge_log.xml
+*sponge_log.xml
 
 # System test environment variables.
 system_tests/local_test_setup
diff --git a/packages/google-cloud-monitoring/.kokoro/build.sh b/packages/google-cloud-monitoring/.kokoro/build.sh
index 712144332886..fb0ee04fadd0 100755
--- a/packages/google-cloud-monitoring/.kokoro/build.sh
+++ b/packages/google-cloud-monitoring/.kokoro/build.sh
@@ -15,7 +15,11 @@
 
 set -eo pipefail
 
-cd github/python-monitoring
+if [[ -z "${PROJECT_ROOT:-}" ]]; then
+    PROJECT_ROOT="github/python-monitoring"
+fi
+
+cd "${PROJECT_ROOT}"
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
@@ -30,16 +34,26 @@ export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
 export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
 
 # Remove old nox
-python3.6 -m pip uninstall --yes --quiet nox-automation
+python3 -m pip uninstall --yes --quiet nox-automation
 
 # Install nox
-python3.6 -m pip install --upgrade --quiet nox
-python3.6 -m nox --version
+python3 -m pip install --upgrade --quiet nox
+python3 -m nox --version
+
+# If this is a continuous build, send the test log to the FlakyBot.
+# See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]]; then
+  cleanup() {
+    chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
+    $KOKORO_GFILE_DIR/linux_amd64/flakybot
+  }
+  trap cleanup EXIT HUP
+fi
 
 # If NOX_SESSION is set, it only runs the specified session,
 # otherwise run all the sessions.
 if [[ -n "${NOX_SESSION:-}" ]]; then
-    python3.6 -m nox -s "${NOX_SESSION:-}"
+    python3 -m nox -s ${NOX_SESSION:-}
 else
-    python3.6 -m nox
+    python3 -m nox
 fi
diff --git a/packages/google-cloud-monitoring/.kokoro/docs/docs-presubmit.cfg b/packages/google-cloud-monitoring/.kokoro/docs/docs-presubmit.cfg
index 1118107829b7..928adfa9551c 100644
--- a/packages/google-cloud-monitoring/.kokoro/docs/docs-presubmit.cfg
+++ b/packages/google-cloud-monitoring/.kokoro/docs/docs-presubmit.cfg
@@ -15,3 +15,14 @@ env_vars: {
     key: "TRAMPOLINE_IMAGE_UPLOAD"
     value: "false"
 }
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-monitoring/.kokoro/build.sh"
+}
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "docs docfx"
+}
diff --git a/packages/google-cloud-monitoring/.trampolinerc b/packages/google-cloud-monitoring/.trampolinerc
index 995ee29111e1..383b6ec89fbc 100644
--- a/packages/google-cloud-monitoring/.trampolinerc
+++ b/packages/google-cloud-monitoring/.trampolinerc
@@ -24,6 +24,7 @@ required_envvars+=(
 pass_down_envvars+=(
     "STAGING_BUCKET"
     "V2_STAGING_BUCKET"
+    "NOX_SESSION"
 )
 
 # Prevent unintentional override on the default image.
diff --git a/packages/google-cloud-monitoring/CONTRIBUTING.rst b/packages/google-cloud-monitoring/CONTRIBUTING.rst
index f34dcc8e058a..cd7cf066718f 100644
--- a/packages/google-cloud-monitoring/CONTRIBUTING.rst
+++ b/packages/google-cloud-monitoring/CONTRIBUTING.rst
@@ -70,9 +70,14 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 - To test your changes, run unit tests with ``nox``::
 
     $ nox -s unit-2.7
-    $ nox -s unit-3.7
+    $ nox -s unit-3.8
     $ ...
 
+- Args to pytest can be passed through the nox command separated by a `--`. For
+  example, to run a single test::
+
+    $ nox -s unit-3.8 -- -k <name of test>
+
   .. note::
 
     The unit tests and system tests are described in the
@@ -93,8 +98,12 @@ On Debian/Ubuntu::
 ************
 Coding Style
 ************
+- We use the automatic code formatter ``black``. You can run it using
+  the nox session ``blacken``. This will eliminate many lint errors. Run via::
+
+   $ nox -s blacken
 
-- PEP8 compliance, with exceptions defined in the linter configuration.
+- PEP8 compliance is required, with exceptions defined in the linter configuration.
   If you have ``nox`` installed, you can test that you have not introduced
   any non-compliant code via::
 
@@ -133,13 +142,18 @@ Running System Tests
 
 - To run system tests, you can execute::
 
-   $ nox -s system-3.7
+   # Run all system tests
+   $ nox -s system-3.8
    $ nox -s system-2.7
 
+   # Run a single system test
+   $ nox -s system-3.8 -- -k <name of test>
+
+
   .. note::
 
       System tests are only configured to run under Python 2.7 and
-      Python 3.7. For expediency, we do not run them in older versions
+      Python 3.8. For expediency, we do not run them in older versions
       of Python 3.
 
   This alone will not run the tests. You'll need to change some local
diff --git a/packages/google-cloud-monitoring/LICENSE b/packages/google-cloud-monitoring/LICENSE
index a8ee855de2aa..d64569567334 100644
--- a/packages/google-cloud-monitoring/LICENSE
+++ b/packages/google-cloud-monitoring/LICENSE
@@ -1,6 +1,7 @@
-                            Apache License
+
+                                 Apache License
                            Version 2.0, January 2004
-                        https://www.apache.org/licenses/
+                        http://www.apache.org/licenses/
 
    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
@@ -192,7 +193,7 @@
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
 
-       https://www.apache.org/licenses/LICENSE-2.0
+       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,
diff --git a/packages/google-cloud-monitoring/MANIFEST.in b/packages/google-cloud-monitoring/MANIFEST.in
index e9e29d12033d..e783f4c6209b 100644
--- a/packages/google-cloud-monitoring/MANIFEST.in
+++ b/packages/google-cloud-monitoring/MANIFEST.in
@@ -16,10 +16,10 @@
 
 # Generated by synthtool. DO NOT EDIT!
 include README.rst LICENSE
-recursive-include google *.json *.proto
+recursive-include google *.json *.proto py.typed
 recursive-include tests *
 global-exclude *.py[co]
 global-exclude __pycache__
 
 # Exclude scripts for samples readmegen
-prune scripts/readme-gen
\ No newline at end of file
+prune scripts/readme-gen
diff --git a/packages/google-cloud-monitoring/docs/_static/custom.css b/packages/google-cloud-monitoring/docs/_static/custom.css
index 0abaf229fce3..bcd37bbd3c4a 100644
--- a/packages/google-cloud-monitoring/docs/_static/custom.css
+++ b/packages/google-cloud-monitoring/docs/_static/custom.css
@@ -1,4 +1,9 @@
 div#python2-eol {
 	border-color: red;
 	border-width: medium;
-} 
\ No newline at end of file
+} 
+
+/* Ensure minimum width for 'Parameters' / 'Returns' column */
+dl.field-list > dt {
+    min-width: 100px
+}
diff --git a/packages/google-cloud-monitoring/google/cloud/monitoring_v3/__init__.py b/packages/google-cloud-monitoring/google/cloud/monitoring_v3/__init__.py
index d427ebfdbb0c..489ba27a37c2 100644
--- a/packages/google-cloud-monitoring/google/cloud/monitoring_v3/__init__.py
+++ b/packages/google-cloud-monitoring/google/cloud/monitoring_v3/__init__.py
@@ -184,10 +184,10 @@
     "ListUptimeCheckConfigsResponse",
     "ListUptimeCheckIpsRequest",
     "ListUptimeCheckIpsResponse",
-    "MetricServiceClient",
     "MutationRecord",
     "NotificationChannel",
     "NotificationChannelDescriptor",
+    "NotificationChannelServiceClient",
     "Point",
     "QueryError",
     "QueryErrorList",
@@ -221,5 +221,5 @@
     "UptimeCheckServiceClient",
     "VerifyNotificationChannelRequest",
     "WindowsBasedSli",
-    "NotificationChannelServiceClient",
+    "MetricServiceClient",
 )
diff --git a/packages/google-cloud-monitoring/samples/snippets/v3/alerts-client/noxfile.py b/packages/google-cloud-monitoring/samples/snippets/v3/alerts-client/noxfile.py
index bca0522ec4d9..97bf7da80e39 100644
--- a/packages/google-cloud-monitoring/samples/snippets/v3/alerts-client/noxfile.py
+++ b/packages/google-cloud-monitoring/samples/snippets/v3/alerts-client/noxfile.py
@@ -85,7 +85,7 @@ def get_pytest_env_vars() -> Dict[str, str]:
 
 # DO NOT EDIT - automatically generated.
 # All versions used to tested samples.
-ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8"]
+ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8", "3.9"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG['ignored_versions']
diff --git a/packages/google-cloud-monitoring/samples/snippets/v3/cloud-client/noxfile.py b/packages/google-cloud-monitoring/samples/snippets/v3/cloud-client/noxfile.py
index bca0522ec4d9..97bf7da80e39 100644
--- a/packages/google-cloud-monitoring/samples/snippets/v3/cloud-client/noxfile.py
+++ b/packages/google-cloud-monitoring/samples/snippets/v3/cloud-client/noxfile.py
@@ -85,7 +85,7 @@ def get_pytest_env_vars() -> Dict[str, str]:
 
 # DO NOT EDIT - automatically generated.
 # All versions used to tested samples.
-ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8"]
+ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8", "3.9"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG['ignored_versions']
diff --git a/packages/google-cloud-monitoring/samples/snippets/v3/uptime-check-client/noxfile.py b/packages/google-cloud-monitoring/samples/snippets/v3/uptime-check-client/noxfile.py
index bca0522ec4d9..97bf7da80e39 100644
--- a/packages/google-cloud-monitoring/samples/snippets/v3/uptime-check-client/noxfile.py
+++ b/packages/google-cloud-monitoring/samples/snippets/v3/uptime-check-client/noxfile.py
@@ -85,7 +85,7 @@ def get_pytest_env_vars() -> Dict[str, str]:
 
 # DO NOT EDIT - automatically generated.
 # All versions used to tested samples.
-ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8"]
+ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8", "3.9"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG['ignored_versions']
diff --git a/packages/google-cloud-monitoring/synth.metadata b/packages/google-cloud-monitoring/synth.metadata
index f42df9731ee6..f174a3cb0964 100644
--- a/packages/google-cloud-monitoring/synth.metadata
+++ b/packages/google-cloud-monitoring/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-monitoring.git",
-        "sha": "bec9e87551baf9ef5d60c81810e3efa01e96377f"
+        "sha": "4cdb1ff439154409c94e347dd5f3b6e2bc40e998"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "6133907dbb3ddab204a17a15d5c53ec0aae9b033"
+        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "6133907dbb3ddab204a17a15d5c53ec0aae9b033"
+        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
       }
     }
   ],
@@ -48,6 +48,7 @@
     ".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",