--- a/taskcluster/ci/legacy/tasks/builds/opt_linux64_st-an.yml
+++ b/taskcluster/ci/legacy/tasks/builds/opt_linux64_st-an.yml
@@ -21,8 +21,9 @@ task:
       MOZHARNESS_ACTIONS: 'get-secrets build generate-build-stats'
       DIST_UPLOADS: ''
       DIST_TARGET_UPLOADS: ''
 
   extra:
     treeherder:
       groupSymbol: "?"
       symbol: S
+      tier: 1

--- a/taskcluster/ci/legacy/tasks/builds/opt_macosx64_st-an.yml
+++ b/taskcluster/ci/legacy/tasks/builds/opt_macosx64_st-an.yml
@@ -15,8 +15,9 @@ task:
       MH_CUSTOM_BUILD_VARIANT_CFG: 'cross-opt'
       DIST_UPLOADS: ''
       DIST_TARGET_UPLOADS: ''
   extra:
     treeherder:
       groupSymbol: "?"
       groupName: Submitted by taskcluster
       symbol: S
+      tier: 1