fix privacy_notice_url for containers.yml (#2869)
fix privacy_notice_url for containers.yml (#2869)

We removed our metrics.md document in the master/4.x branch.
chuckharmston/testpilot,chuckharmston/testpilot,chuckharmston/testpilot,lmorchard/idea-town,chuckharmston/testpilot,lmorchard/idea-town,fzzzy/testpilot,lmorchard/testpilot,lmorchard/testpilot,mozilla/idea-town,lmorchard/idea-town-server,lmorchard/idea-town-server,mozilla/idea-town-server,lmorchard/idea-town,mozilla/idea-town-server,meandavejustice/testpilot,flodolo/testpilot,lmorchard/idea-town-server,mozilla/idea-town-server,lmorchard/testpilot,fzzzy/testpilot,lmorchard/testpilot,lmorchard/idea-town,flodolo/testpilot,meandavejustice/testpilot,mozilla/idea-town,lmorchard/idea-town-server,mozilla/idea-town,meandavejustice/testpilot,meandavejustice/testpilot,mozilla/idea-town,flodolo/testpilot,fzzzy/testpilot,fzzzy/testpilot,mozilla/idea-town-server,flodolo/testpilot