diff --git a/config/flutter_config.star b/config/flutter_config.star
index d8867e0..ccc2c5d 100644
--- a/config/flutter_config.star
+++ b/config/flutter_config.star
@@ -97,6 +97,8 @@
         caches = ci_yaml.legacy_swarming_caches(ci_yaml_config, None, "linux_android"),
         dimensions = {"device_type": "msm8952"},
         os = platform_properties["linux_android"]["os"],
+        # Uploads metrics only for master/main branches, where prefix is empty.
+        properties = {"upload_metrics": True} if not prefix else {},
     )
     common.mac_prod_builder(
         name = "%sMac SDK Drone" % prefix,
diff --git a/config/generated/flutter/luci/cr-buildbucket.cfg b/config/generated/flutter/luci/cr-buildbucket.cfg
index a8adfb8..9662208 100644
--- a/config/generated/flutter/luci/cr-buildbucket.cfg
+++ b/config/generated/flutter/luci/cr-buildbucket.cfg
@@ -669,6 +669,7 @@
         '  "goma_jobs": "200",'
         '  "mastername": "client.flutter",'
         '  "recipe": "devicelab/devicelab_test_drone",'
+        '  "upload_metrics": true,'
         '  "upload_packages": true'
         '}'
       execution_timeout_secs: 3600