This complicates checking liveness of staging environment (== it's ~= dead).

1. Logout from luci-milo-dev.appspot.com
2. Go to https://luci-milo-dev.appspot.com/buildbucket/luci.infra.continuous/infra-continuous-trusty-64?server=cr-buildbucket-dev.appspot.com
3. Click on any build.
4. Observe "Build pending" status and "Waiting... waiting for annotation stream" steps: https://screenshot.googleplex.com/781j0wjm0Bu.png
5. The corresponding Swarming job looks fine (successfully completed): https://chromium-swarm-dev.appspot.com/task?id=349a490dce3b7510&refresh=10