Port the qualified web preview at c41e6fa8940fba929704bc2f9a94f119fef4a4ca onto
org dev b4d498e697. Preserve upstream changes and
branch policies; keep the independent private Collector service separate.
Preview-Version: 2.2.1-n30nex.1
Preview-Revision: c41e6fa8940fba929704bc2f9a94f119fef4a4ca
Lands the stacked web PRs #75, #79, #80, #81, #83, #85, #87, #89, #92, #95 and #99 in one squash. Server counterparts #166-#176 are merged. Remaining review items follow in a fix PR.