diff --git a/taskcluster/ci/source-test/python.yml b/taskcluster/ci/source-test/python.yml
--- a/taskcluster/ci/source-test/python.yml
+++ b/taskcluster/ci/source-test/python.yml
@@ -62,26 +62,10 @@
         subsuite: fog
     when:
         files-changed:
             - 'toolkit/components/glean/**'
 
-mach:
-    description: python/mach unit tests
-    platform:
-        - linux1804-64/opt
-        - macosx1014-64/opt
-        - windows10-64/opt
-    python-version: [3]
-    treeherder:
-        symbol: mach
-    run:
-        using: python-test
-        subsuite: mach
-    when:
-        files-changed:
-            - 'python/mach/**'
-
 marionette-harness:
     description: testing/marionette/harness unit tests
     platform:
         - linux1804-64/opt
         - windows10-64/opt
diff --git a/taskcluster/ci/source-test/taskgraph.yml b/taskcluster/ci/source-test/taskgraph.yml
--- a/taskcluster/ci/source-test/taskgraph.yml
+++ b/taskcluster/ci/source-test/taskgraph.yml
@@ -15,10 +15,12 @@
         artifacts:
             - type: directory
               name: public/taskgraph
               path: /builds/worker/artifacts
     always-target: true
+    attributes:
+        code-review: true
     treeherder:
         kind: test
         platform: gecko-decision/opt
         symbol: tgdiff
         tier: 2