User-Agent Reduction
Proposed Rollout Plan Token Reference UA Token to UA-CH Mapping Sample UA Strings: Phase 4 Sample UA Strings: Phase 5 Sample UA Strings: Phase 6 Sample UA Strings: Final Reduced State Reduced navigator.platform values (for all versions) Reduced navigator.appVersion values Reduced navigator.userAgent values Alternative: high entropy client hints April 11, 2022: Add a table to map from UA to UA-CH March 3, 2022: Added frozen Chrome OS platform version to value February 18, 2022: Added information on the platforms for which User-Agent reduction is applicable, as well as links to resources.
https://www.chromium.org/updates/ua-reduction/