autotest: temporarily disable lab inventory on some unhealthy boards

BUG=chromium:861806, chromium:846012, chromium:854404
TEST=None

Change-Id: Ibf0efeb0881056bbcb40a5bc5183a764bf5afd90
Reviewed-on: https://chromium-review.googlesource.com/1135997
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/site_utils/lab_inventory.py b/site_utils/lab_inventory.py
index 98b1f39..79fbb5b 100755
--- a/site_utils/lab_inventory.py
+++ b/site_utils/lab_inventory.py
@@ -79,8 +79,12 @@
 #   + 'adb' - We're not ready to monitor Android or Brillo hosts.
 #   + 'board:guado_moblab' - These are maintained by a separate
 #     process that doesn't use this script.
+#   + 'board:scarlet' due to crbug.com/846012 and other issues discussed at
+#   https://bugs.chromium.org/p/chromium/issues/detail?id=861806#c2
+#   + 'board:veyron_rialto' due to crbug.com/854404
 
-_EXCLUDED_LABELS = {'adb', 'board:guado_moblab'}
+_EXCLUDED_LABELS = {'adb', 'board:guado_moblab', 'board:scarlet',
+                    'board:veyron_rialto'}
 
 # _DEFAULT_DURATION:
 #     Default value used for the --duration command line option.