Re: [blink-dev] Intent to Implement & Ship: User-Agent Reduction Phase 5 (platform and OsCpu reduction)

Thu, 01 Dec 2022 12:55:50 -0800

Thanks Ziling. We're unlikely to make the change just ahead of the weekend, but will ping this thread early next week once the move to 5% is submitted. 

On 12/1/22 1:36 PM, Ziling Zhao wrote:

Hey Mike,
I think moving to 5% early sounds good for YouTube. The 1% doesn't seem to be giving us consistent data and we would want to get more traffic as soon as possible. If we were to move forward, would this re-roll the experiment or just expand? How soon would we be able to roll this out? 

Thanks!
On Mon, Nov 28, 2022 at 3:33 PM Mike Taylor <miketa...@chromium.org> wrote: 

    Hi Ziling,

    (forgive the delay in replying, I took some time off and managed
    to not check my email)

    Based on the other feedback we've received both internally and
    externally (and the lack of any negative impact thus far), I don't
    think we want to add an additional month to our rollout schedule
    before hitting 100%. Another possible option would be to move to
    5% sooner, at least 1 month ahead of Jan 9th, ideally with enough
    time to observe metrics ahead of the Finch freeze on Dec 16th, in
    case something scary happens that would warrant a rollback.

    Would that work for YouTube?

    thanks,
    Mike

    On 11/17/22 7:12 PM, Ziling Zhao wrote:

    Hello,

    YouTube -- and various other Google properties -- have been
    analyzing the results of this 1% experiment. We're concerned that
    the 1% may not provide enough data especially due to the amount
    of slicing (modern chrome, non windows vs. legacy windows, etc.).
    On YT, we are seeing significant metrics impact on, and given the
    holidays, there's a short amount of time available for us to
    iterate and debug issues before we rollout to 10%.

    We'd like to propose:

      * An intermediate state of 5% on January 9th rather than
        jumping directly to 10%.
      * The 5% should hold for at least a month, enough for us to do
        a few rounds of experimental analysis and debugging.


    Thanks.

    On Wednesday, November 2, 2022 at 4:32:02 PM UTC-7
    mike...@chromium.org wrote:

        Howdy blink-dev,

        Phase 5 of UA Reduction is currently ramping up to 1% of the
        stable release population. No changes will occur between now
        and January 9th, pending site compatibility feedback.

        thanks,
        Mike

        On 9/7/22 12:16 PM, Victor Tan wrote:

        Thanks all. I just realized there are some date typos for
        the roll out plan. Update as follows:

        Stage

                

        Time

                

        Date

        Stable 1% (M107+)

        Canary/Dev/Beta 100%

                

        M107 stable release is shipping to 100% (a best guess)

                

        Nov 1, 2022

        Stable 10% (M107/M108/M109)

                

        ~10 weeks after previous stage

                

        Jan 9, *2023*

        Stable 50%

        (M107/M108/M109)

                

        ~2 weeks

                

        Jan 23, *2023*

        TOT Default (M111)

                

        ~2 weeks after previous stage

                

        Feb 7, *2023*

        Stable 100% (M107=>M111)

                

        ~ Same business day as previous stage

                

        Feb 7, *2023*


        Bests,
        Victor

        On Wed, Sep 7, 2022 at 11:59 AM Yoav Weiss
        <yoav...@chromium.org> wrote:

            LGTM3

            On Wed, Sep 7, 2022 at 5:51 PM Daniel Bratell
            <brat...@gmail.com> wrote:

                LGTM2

                /Daniel

                On 2022-09-07 17:50, Chris Harrelson wrote:

                LGTM1. If any issues come up during this rollout
                that affect the plan, please bring them back to
                this thread for our consideration.

                On Thu, Sep 1, 2022 at 11:29 AM Victor Tan
                <vict...@chromium.org> wrote:


                            Contact emails

                    mike...@chromium.org, vict...@chromium.org


                            Explainer

                    
https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity
                    
<https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity>


                            Specification

                    https://www.chromium.org/updates/ua-reduction
                    <https://www.chromium.org/updates/ua-reduction>is
                    the closest thing that specifies Chrome’s UA
                    Reduction plans today. As these changes land in
                    Chromium and ship to 100% of stable, the Compat
                    Standard <https://compat.spec.whatwg.org/>will
                    be updated in the UA String section
                    <https://compat.spec.whatwg.org/#ua-string-pattern-chrome>,
                    like we did for the Phase 4 changes.


                            Summary

                    As previously detailed on the Chromium Blog
                    
<https://blog.chromium.org/2021/09/user-agent-reduction-origin-trial-and-dates.html>,
                    we intend to proceed with Phase 5 of the
                    User-Agent Reduction plan
                    
<https://www.chromium.org/updates/ua-reduction/#sample-ua-strings-phase-5>.
                    In Phase 5, the User-Agent string changes the
                    platform and oscpu tokens from their
                    platform-defined values to the relevant
                    unifiedPlatform
                    
<https://www.chromium.org/updates/ua-reduction/#token-reference>token
                    value. The `navigator.platform`,
                    `navigator.platform`, and
                    `navigator.appVersion` JS APIs will be
                    similarly reduced.


                            Blink component

                    Blink>Network>ClientHints


                            TAG review

                    https://github.com/w3ctag/design-reviews/issues/640
                    <https://github.com/w3ctag/design-reviews/issues/640>


                            TAG review status

                    Closed with concerns.


                            Risks


                            Interoperability and Compatibility

                    Any time you modify the User-Agent string there
                    is a risk of some content somewhere depending
                    on the previous format.


                    We do not expect interop risks, as each browser
                    sends its own User-Agent string format. But
                    there is a risk, especially on legacy Windows
                    platforms, that content somewhere is relying on
                    User-Agents to parse platform and oscpu
                    information. We believe the risk is somewhat
                    low. But in order to mitigate the risk of this
                    change, we intend to slowly roll it out via
                    Finch creating two sub groups: one group
                    enabling the feature for all platforms except
                    legacy Windows platforms, another group
                    enabling the feature on legacy Windows
                    platforms and observing health metrics and bug
                    reports. This gives us the option to roll this
                    back specifically for legacy Windows clients if
                    needed, but proceed for other platforms.


                    Displaying a modern OS version for legacy
                    clients will not create a problem syntactically
                    on legacy Windows platforms. But the web can
                    get pretty weird in ways we don't anticipate,
                    hence the slow roll-out and incremental path
                    towards User-Agent Reduction.


                    Here is our proposed rollout plan, with the
                    understanding that if we discover concerning
                    breakage or regressions via health metrics or
                    bug reports we will pause the rollout or roll
                    back the feature entirely (and update this
                    thread if so):


                    Stage

                        

                    Time

                        

                    Date

                    Stable 1% (M107+)

                    Canary/Dev/Beta 100%

                        

                    M107 stable release is shipping to 100% (a best
                    guess)

                        

                    Nov 1, 2022

                    Stable 10% (M107/M108/M109)

                        

                    ~10 weeks after previous stage

                        

                    Jan 9, 2022

                    Stable 50%

                    (M107/M108/M109)

                        

                    ~2 weeks

                        

                    Jan 23, 2022

                    TOT Default (M111)

                        

                    ~2 weeks after previous stage

                        

                    Feb 7, 2022

                    Stable 100% (M107=>M111)

                        

                    ~ Same business day as previous stage

                        

                    Feb 7, 2022



                    Gecko: Shipped/Shipping. Firefox has frozen (or
                    capped) much of their UA string already.

                    WebKit: Shipped/Shipping. Safari has already
                    frozen everything in their desktop UA string
                    except for Safari and WebKit versions.

                    Web developers: Mixed signals. Reactions have
                    ranged from positive to indifferent to
                    negative, from various channels.


                            Debuggability

                    No special DevTools support needed.


                            Will this feature be supported on all
                            six Blink platforms (Windows, Mac,
                            Linux, Chrome OS, Android, and Android
                            WebView)?

                    No (Only for desktop platforms: Windows, Mac,
                    Linux, Chrome OS)


                            Is this feature fully tested by
                            web-platform-tests
                            
<https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>?

                    No


                            Flag name

                    #reduce-user-agent-platform-oscpu


                            Tracking bug

                    
https://bugs.chromium.org/p/chromium/issues/detail?id=1339834
                    
<https://bugs.chromium.org/p/chromium/issues/detail?id=1339834>


                            Launch bug

                    
https://bugs.chromium.org/p/chromium/issues/detail?id=1346071
                    
<https://bugs.chromium.org/p/chromium/issues/detail?id=1346071>


                            Link to entry on the Chrome Platform Status

                    https://chromestatus.com/feature/5098783126323200
                    <https://chromestatus.com/feature/5098783126323200>
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~ Ziling Zhao


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