Intent to Ship: Cookies Having Independent Partitioned State (CHIPS)

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Dylan Cutler

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20 अक्तू॰ 2022, 4:57:20 pm20/10/22
ईमेल पाने वाला blin...@chromium.org

Contact emails:

dylan...@google.com, kaust...@google.com 


Proposal repository:

https://github.com/privacycg/CHIPS


Design doc:

https://docs.google.com/document/d/1wL2lCXpaVOi0cWOn_ehfLFIZQxT3t0SH-ANnZYPEB0I/edit?usp=sharing


Specification:

https://datatracker.ietf.org/doc/draft-cutler-httpbis-partitioned-cookies/


Summary:

Given that Chrome plans to deprecate unpartitioned third-party cookies, we want to give developers the ability to use cookies in cross-site contexts that are partitioned by top-level site to meet use cases that don't track users cross-site (e.g. SaaS embeds, headless CMS, sandbox domains, etc.). Chrome will introduce a mechanism to opt into having third-party cookies partitioned by top-level site using a new cookie attribute, Partitioned.


Since we announced our Intent to Experiment with CHIPS, there have been some changes to the API:


  • The Partitioned attribute no longer requires the __Host- prefix or its required attributes. The Secure requirement remains.

  • We are changing the per-partition-per-domain limit to be based on the total size (in bytes) of the cookies set by a domain in a particular partition in addition to the number of cookies. We intend to impose a limit of 10 KB per-embedded-site, per-top-level-site and increase the numeric limit from 10 to 180.

  • For sites embedded in top-level domains that are in a First-Party Set, their cookies' partition key will no longer be the owner domain of that set. Rather, the partition key will always be the top-level domain that the cookie was created on.


Blink component:

Internals>Network>Cookies


TAG review:

https://github.com/w3ctag/design-reviews/issues/654 (Supportive early review)

https://github.com/w3ctag/design-reviews/issues/779 (Oct 19 specification review)


Risks



Interoperability and Compatibility

Firefox: Positive


WebKit: Supported incubation, Official position pending


Web developers: Developers have indicated that CHIPS does solve for many use cases that depend on access to cookies in cross-site contexts (1, 2, 3). Through incubation, and the Origin Trial, we received feedback to improve ease-of-use, particularly to allow for easier migration of existing systems to use CHIPS. We believe we have satisfactorily resolved these concerns (see changes made listed under Summary section).


Other signals:


Ergonomics

N/A



Activation

This feature introduces a new cookie attribute, Partitioned, which is opt-in only. Sites which do not set their cookies with Partitioned should not see any change in the browser's behavior when we ship.



Security

See S&P questionnaire for TAG



WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

This feature does not deprecate or change behavior of existing APIs. This feature is behind a killswitch.



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

Yes


Is this feature covered by web platform tests?

Yes


Flag name

partitioned-cookies


Requires code in //chrome?

No


Tracking bug:

https://crbug.com/1225444


Non-OSS dependencies

Does the feature depend on any code or APIs outside the Chromium open source repository and its open-source dependencies to function?

Not anymore than cookies already do now.


Estimated milestones

OriginTrial desktop last

106

OriginTrial desktop first

100


OriginTrial Android last

106

OriginTrial Android first

100


Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

List of open issues: https://github.com/privacycg/CHIPS/issues


Chrome Platform Status page:

https://chromestatus.com/feature/5179189105786880


Links to previous Intent discussions

Intent to Prototype:

https://groups.google.com/a/chromium.org/g/blink-dev/c/hvMJ33kqHRo/


Intent to Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/_dJFNJpf91U/m/YqP09XbbAgAJ


Intent to Extend Experiment:

https://groups.google.com/a/chromium.org/g/blink-dev/c/kZRtetS8jsY/m/ppK4kDbqAwAJ

https://groups.google.com/a/chromium.org/g/blink-dev/c/MKQODOL0Fso/m/nZXI2dqwAQAJ


Dylan Cutler

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20 अक्तू॰ 2022, 5:33:16 pm20/10/22
ईमेल पाने वाला blin...@chromium.org
Estimated Milestone for Shipping:
109

Apologies, I included the OT milestones instead...

Mike West

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25 अक्तू॰ 2022, 5:00:56 am25/10/22
ईमेल पाने वाला Dylan Cutler, blin...@chromium.org
Thanks for the work you've put in through security and privacy review on this feature. It's an important step towards our ability to remove third-party cookie access, and I'm looking forward to seeing it used more widely in the future as we continue down that path. That said, I have a few thoughts:

1.  I'd be happier if we'd been able to keep the `__Host-`-like restrictions on `Domain` and `Path` (even if not the prefix); that seems like a missed opportunity, given that we're going to need to support CHIPS into the indefinite future. The patch removing these requirements (https://github.com/privacycg/CHIPS/pull/46) references discussion on a PrivacyCG(?) call, but I wasn't able to find minutes. Could you help me understand the rationale?

2. There are a few issues open against the spec that seem like they ought to be resolved before shipping. https://github.com/privacycg/CHIPS/issues/58https://github.com/privacycg/CHIPS/issues/40, and https://github.com/privacycg/CHIPS/issues/2 all seem like they would benefit from explicit resolution. Do you think those ought to be considered blockers?

-mike


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Rick Byers

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28 अक्तू॰ 2022, 12:00:59 pm28/10/22
ईमेल पाने वाला Mike West, Dylan Cutler, blin...@chromium.org
I'm excited to see this being close to shipping! Minor questions on the tests below:

I see there is one failing subtest on Chrome 108. Known issue that will be fixed prior to shipping?

Also the harness is failing on Safari and Firefox, is that just because the test has a dependency on the Cookie Store API (while CHIPS is orthogonal from the API)? If Firefox decided to implement CHIPS but not Cookie Store would we be able / willing to modify the tests to pass on Firefox?

Dylan Cutler

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10 नव॰ 2022, 6:40:38 pm10/11/22
ईमेल पाने वाला Rick Byers, Mike West, blin...@chromium.org

Hey Mike,


Thanks for your comments, let me address your two points:


I'd be happier if we'd been able to keep the `__Host-`-like restrictions on `Domain` and `Path` (even if not the prefix); that seems like a missed opportunity, given that we're going to need to support CHIPS into the indefinite future. The patch removing these requirements (https://github.com/privacycg/CHIPS/pull/46) references discussion on a PrivacyCG(?) call, but I wasn't able to find minutes. Could you help me understand the rationale?

The PrivacyCG feedback is best summarized here but the notes are sparse. While it would be ideal to keep the Domain restriction, we came to the conclusion that requiring no-Domain will make adoption of partitioned cookies more difficult for websites based on partner feedback (example), since there is significant site re-architecting that may be needed to adapt to the requirement.


As for Path, restricting Path to only "/" seems not necessary after removing the Domain restriction. During a PrivacyCG call on the matter, we also heard from partners that third-party embeds have use cases for setting cookie paths. You can see notes on the call here.


We are still requiring that cookies set with Partitioned should be set with Secure, and have no plans to remove that requirement.


There are a few issues open against the spec that seem like they ought to be resolved before shipping. https://github.com/privacycg/CHIPS/issues/58, https://github.com/privacycg/CHIPS/issues/40, and https://github.com/privacycg/CHIPS/issues/2 all seem like they would benefit from explicit resolution. Do you think those ought to be considered blockers?

Let me address each issue you linked:

For issue 58, "Specify what happens when partitioned cookies collide with same-name unpartitioned cookies," we believe that the correct behavior is to save and send both cookies. There is precedent for saving/storing multiple cookies with the same name. The Storage Model section of RFC626bis already defines how to handle cookies with the same name by treating cookies as unique based on their {name, domain, path}. Our implementation adds the cookie's partition key to this tuple. We have added a PR to our draft spec which we are publishing to the IETF datatracker. The issue has been closed now.

Issue 40, "Keying of "CHIPS" cookies should align with other state," can be reworded as "Should the cookie partition key have a cross-site ancestor chain bit?". The primary difference between Chromium’s storage partition key and cookie partition key is that the storage key has an additional bit which indicates whether the frame has a cross-site ancestor. This was added in order to fix an existing limitation where SameSite cookie semantics are not accounted for in service workers. Our thinking is that this bit is not relevant for the cookie partition key, since site developers can restrict which cookies are available in embedded contexts using the SameSite attribute already.

Issue 2, "User agents should indicate to servers whether a request is cross-site," we have not come to a solution for this but we think that mechanism applies to state partitioning broadly (not just CHIPS), and probably doesn't affect the UA's treatment of cookies. So, our request is to not treat this as a blocker for the launch of CHIPS.

Given that we have closed #58, #40 has a proposed resolution, and #2 should not be a blocker for the launch of CHIPS, we think we are ready to ship.

Hey Rick,

Let me answer your question as well.

I see there is one failing subtest on Chrome 108. Known issue that will be fixed prior to shipping?

That failure is expected since partitioned cookies are not enabled in Chrome 108. Cookies set with the Partitioned attribute in that version will create unpartitioned third-party cookies. Once the feature is enabled in Chrome 109 then the test should pass.

Also the harness is failing on Safari and Firefox, is that just because the test has a dependency on the Cookie Store API (while CHIPS is orthogonal from the API)?

That is entirely possible. Good catch! I am fixing this and will have a CL up shortly.

If Firefox decided to implement CHIPS but not Cookie Store would we be able / willing to modify the tests to pass on Firefox?

I suppose any CookieStore-related test could be guarded on the existence of window.cookieStore, so that those tests are skipped if the browser does not support the API.


Mike Taylor

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11 नव॰ 2022, 10:22:41 am11/11/22
ईमेल पाने वाला blink-dev, dylan...@google.com, Mike West, blin...@chromium.org, Rick Byers
On Thursday, November 10, 2022 at 6:40:38 PM UTC-5 dylan...@google.com wrote:

Hey Rick,

Let me answer your question as well.

I see there is one failing subtest on Chrome 108. Known issue that will be fixed prior to shipping?

That failure is expected since partitioned cookies are not enabled in Chrome 108. Cookies set with the Partitioned attribute in that version will create unpartitioned third-party cookies. Once the feature is enabled in Chrome 109 then the test should pass.

Also the harness is failing on Safari and Firefox, is that just because the test has a dependency on the Cookie Store API (while CHIPS is orthogonal from the API)?

That is entirely possible. Good catch! I am fixing this and will have a CL up shortly.

If Firefox decided to implement CHIPS but not Cookie Store would we be able / willing to modify the tests to pass on Firefox?

I suppose any CookieStore-related test could be guarded on the existence of window.cookieStore, so that those tests are skipped if the browser does not support the API.

Unless we consider Cookie Store to be a normative requirement of CHIPS (and I don't think we do), that doesn't seem like a great outcome. Can I ask what WPT is missing to be able to write these tests in a cross-browser fashion? A better outcome would be to add the missing functionality to WPT itself.

Mike Taylor

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11 नव॰ 2022, 12:12:10 pm11/11/22
ईमेल पाने वाला blink-dev, Mike Taylor, dylan...@google.com, Mike West, blin...@chromium.org, Rick Byers
On Friday, November 11, 2022 at 10:22:41 AM UTC-5 Mike Taylor wrote:
Unless we consider Cookie Store to be a normative requirement of CHIPS (and I don't think we do), that doesn't seem like a great outcome. Can I ask what WPT is missing to be able to write these tests in a cross-browser fashion? A better outcome would be to add the missing functionality to WPT itself.

After looking at the failing test in question, I see that you're testing that CookieStore can correctly handle a partitioned cookie. Maybe that test should live in the cookie-store directory as follow-up work, but a quick workaround to feature-detect like you described seems fine for now.

Mike West

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22 नव॰ 2022, 11:10:52 am22/11/22
ईमेल पाने वाला blink-dev, Mike Taylor, dylan...@google.com, Mike West, blin...@chromium.org, Rick Byers
LGTM1.

I think the loss of the domain restriction is quite unfortunate, but I understand why you landed on that as the simplest path for deployment. My feeling is that folks are going to have to rework things in any event, and this would be an opportune time to revisit same-site-but-cross-origin cookie access within partitions to make the eventual work to align cookies with the origin model easier in the future. At the same time, I recognize that that's a problem that's not made any worse by shipping this feature, and I'll defer to y'all on the short-term deployment tradeoffs.

On the issues, I'd appreciate y'all taking another pass through to make sure there aren't any decisions lurking in the tracker that will be hard to revisit once we ship. I'd also appreciate you finalizing the resolution to https://github.com/privacycg/CHIPS/issues/40, which looks like there's still some ongoing discussion. That's the only issue I saw in a very quick pass that looked like it clearly required resolution before shipping, but y'all are more familiar with the conversations on the topic than I am. :)

Thanks!

-mike

Yoav Weiss

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22 नव॰ 2022, 11:28:53 pm22/11/22
ईमेल पाने वाला Dylan Cutler, blin...@chromium.org
Can you expand on the plans for this I-D? Have y'all talked to the HTTPWG?
 
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Johann Hofmann

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23 नव॰ 2022, 11:34:20 am23/11/22
ईमेल पाने वाला Yoav Weiss, Dylan Cutler, blin...@chromium.org
Hi Yoav,

On Wed, Nov 23, 2022 at 5:28 AM Yoav Weiss <yoav...@chromium.org> wrote:


On Thu, Oct 20, 2022 at 10:57 PM 'Dylan Cutler' via blink-dev <blin...@chromium.org> wrote:

Can you expand on the plans for this I-D? Have y'all talked to the HTTPWG? 

Yes, this is being discussed in HTTPWG. Dylan presented CHIPS at IETF 115, minutes are here: https://httpwg.org/wg-materials/ietf115/minutes.html#cookies 

One important thing to note is that the HTML/Fetch <-> Cookies spec interfaces aren't well defined at the moment, which also affects other specs that deal with cookie changes such as the Storage Access API. We're working on fixing this in a larger effort called "cookie layering", which is intended to give Fetch some more responsibility in providing the information that is used to select cookies from the cookie store. This way we can actually access concepts like "top-level site" at the right implementation layer. So, in the mid-term, parts of CHIPS will likely end up back in HTML and Fetch.

In the meantime, like for SameSite, the RFC will hand-wave some of the browser bits.
 

Chris Harrelson

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23 नव॰ 2022, 11:37:31 am23/11/22
ईमेल पाने वाला Johann Hofmann, Yoav Weiss, Dylan Cutler, blin...@chromium.org
On Wed, Nov 23, 2022 at 10:34 AM 'Johann Hofmann' via blink-dev <blin...@chromium.org> wrote:
Hi Yoav,

On Wed, Nov 23, 2022 at 5:28 AM Yoav Weiss <yoav...@chromium.org> wrote:


On Thu, Oct 20, 2022 at 10:57 PM 'Dylan Cutler' via blink-dev <blin...@chromium.org> wrote:

Can you expand on the plans for this I-D? Have y'all talked to the HTTPWG? 

Yes, this is being discussed in HTTPWG. Dylan presented CHIPS at IETF 115, minutes are here: https://httpwg.org/wg-materials/ietf115/minutes.html#cookies 

Great. Were there any concerns raised there that might create a risk for CHIPS?
 

Johann Hofmann

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24 नव॰ 2022, 4:43:30 am24/11/22
ईमेल पाने वाला Chris Harrelson, Yoav Weiss, Dylan Cutler, blin...@chromium.org
On Wed, Nov 23, 2022 at 5:37 PM Chris Harrelson <chri...@chromium.org> wrote:


On Wed, Nov 23, 2022 at 10:34 AM 'Johann Hofmann' via blink-dev <blin...@chromium.org> wrote:
Hi Yoav,

On Wed, Nov 23, 2022 at 5:28 AM Yoav Weiss <yoav...@chromium.org> wrote:


On Thu, Oct 20, 2022 at 10:57 PM 'Dylan Cutler' via blink-dev <blin...@chromium.org> wrote:

Can you expand on the plans for this I-D? Have y'all talked to the HTTPWG? 

Yes, this is being discussed in HTTPWG. Dylan presented CHIPS at IETF 115, minutes are here: https://httpwg.org/wg-materials/ietf115/minutes.html#cookies 

Great. Were there any concerns raised there that might create a risk for CHIPS?

Not as far as I'm aware of. I couldn't attend the meeting in person, but revisited it with the team. From what I was told the main discussion point was whether we shouldn't just partition all 3P cookies by default instead of giving developers the ability to decide. It's a valid question, but one that has been extensively discussed between browser vendors in Privacy CG, and both Safari and Chrome have made it clear that they strongly prefer blocking 3P cookies by default (with Firefox not being opposed to that). We'll of course keep on engaging with these concerns and questions in HTTPWG, but it seems like a decision that ultimately browsers should have the most authority on.

In any case, I don't think that this discussion presents any compat risk for CHIPS, as the Partitioned attribute would be compatible with a hypothetical partition-by-default future (i.e. by being a no-op).

Yoav Weiss

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24 नव॰ 2022, 5:24:49 am24/11/22
ईमेल पाने वाला Johann Hofmann, Chris Harrelson, Dylan Cutler, blin...@chromium.org
LGTM2

On Thu, Nov 24, 2022 at 10:43 AM Johann Hofmann <joha...@google.com> wrote:


On Wed, Nov 23, 2022 at 5:37 PM Chris Harrelson <chri...@chromium.org> wrote:


On Wed, Nov 23, 2022 at 10:34 AM 'Johann Hofmann' via blink-dev <blin...@chromium.org> wrote:
Hi Yoav,

On Wed, Nov 23, 2022 at 5:28 AM Yoav Weiss <yoav...@chromium.org> wrote:


On Thu, Oct 20, 2022 at 10:57 PM 'Dylan Cutler' via blink-dev <blin...@chromium.org> wrote:

Can you expand on the plans for this I-D? Have y'all talked to the HTTPWG? 

Yes, this is being discussed in HTTPWG. Dylan presented CHIPS at IETF 115, minutes are here: https://httpwg.org/wg-materials/ietf115/minutes.html#cookies 

Great. Were there any concerns raised there that might create a risk for CHIPS?

Not as far as I'm aware of. I couldn't attend the meeting in person, but revisited it with the team. From what I was told the main discussion point was whether we shouldn't just partition all 3P cookies by default instead of giving developers the ability to decide. It's a valid question, but one that has been extensively discussed between browser vendors in Privacy CG, and both Safari and Chrome have made it clear that they strongly prefer blocking 3P cookies by default (with Firefox not being opposed to that). We'll of course keep on engaging with these concerns and questions in HTTPWG, but it seems like a decision that ultimately browsers should have the most authority on.

In any case, I don't think that this discussion presents any compat risk for CHIPS, as the Partitioned attribute would be compatible with a hypothetical partition-by-default future (i.e. by being a no-op).

Thanks for the details! :)

Rick Byers

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24 नव॰ 2022, 10:55:29 am24/11/22
ईमेल पाने वाला Yoav Weiss, Johann Hofmann, Chris Harrelson, Dylan Cutler, blin...@chromium.org

Dylan Cutler

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6 जन॰ 2023, 1:08:05 pm6/1/23
ईमेल पाने वाला Rick Byers, Yoav Weiss, Johann Hofmann, Chris Harrelson, blin...@chromium.org
Hey all, quick update.

We intend to roll out the feature in gradual increments starting January 10, 2023; and expect to reach 5% of Chrome instances on January 24, 2023 and stay there for a couple of weeks. Once we are satisfied that there is no regression in metrics/behavior, we will proceed with the rollout.

Dylan Cutler

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1 फ़र॰ 2023, 1:46:10 pm1/2/23
ईमेल पाने वाला Rick Byers, Yoav Weiss, Johann Hofmann, Chris Harrelson, blin...@chromium.org
Hey all,

Another quick update. Due to a partitioned cookies privacy bug that was discovered, we have to delay the launch of CHIPS to M110, which is the most recent release with the patch.

Since M110 has been released to beta, we have enabled the PartitionedCookies feature on 50% of dev/beta/canary. We will begin rolling out to 1% stable next week.

Thanks,
Dylan

Dylan Cutler

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9 फ़र॰ 2023, 11:36:49 am9/2/23
ईमेल पाने वाला blink-dev, Dylan Cutler, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, blin...@chromium.org, rby...@chromium.org
Hey all,

We have enabled the PartitionedCookies feature on 1% of stable. We will continue to keep the feature enabled on 50% of canary/dev/beta.

Thanks,
Dylan

Dylan Cutler

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22 फ़र॰ 2023, 6:41:17 pm22/2/23
ईमेल पाने वाला blink-dev, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hey all,

Another update for CHIPS, we will be rolling out to 5% stable starting tomorrow. Canary/beta/dev will remain enabled at 50%.

Thanks,
Dylan

Dylan Cutler

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2 मार्च 2023, 4:16:16 pm2/3/23
ईमेल पाने वाला blink-dev, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hey all,

We were planning to ramp up CHIPS to 50% of stable this week, but upon doing metrics analysis we see some guardrail metrics have variations between our control/experiment groups. We are delaying the ramp-up a couple days to do additional analysis to make sure the variations are legitimate and/or are actually caused by partitioned cookies.

Thanks,
Dylan

Dylan Cutler

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9 मार्च 2023, 1:48:09 pm9/3/23
ईमेल पाने वाला blink-dev, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hey all,

Another update. We decided to roll out CHIPS to 10% of stable instead of 50% to get a better picture on whether CHIPS is having impacts on any of our guiding metrics before rolling out to 50%. Our plan is to let the experiment gather data for 7 days at 10% before checking metrics again and rolling out to 50%.

Thanks,
Dylan

Dylan Cutler

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21 मार्च 2023, 9:52:40 am21/3/23
ईमेल पाने वाला Alexandru Mihai, blink-dev, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hey Alexandru,

Thanks for following up. We are still at 10% at the moment. We noticed some regressions in UMA metrics which we have contacted owners (just two teams) to see if they are a concern, and if they are worth blocking the release to 50%. Once I get the green light from them, I will begin the rollout to 50%.

Thanks,
Dylan

On Tue, Mar 21, 2023 at 8:57 AM Alexandru Mihai <a.m...@eyeo.com> wrote:
Hi @Dylan,

What's the current status of the rollout? Have you moved to 50%?

Best,
Alex M

Alexandru Mihai

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21 मार्च 2023, 12:47:46 pm21/3/23
ईमेल पाने वाला blink-dev, Dylan Cutler, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hi @Dylan,

What's the current status of the rollout? Have you moved to 50%?

Best,
Alex M

Kaustubha Govind

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30 मार्च 2023, 8:43:06 am30/3/23
ईमेल पाने वाला blink-dev, Alexandru Mihai, Dylan Cutler, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Hi Alex,

Apologies for the late response. The rollout is currently still at 10%; but we've been able to make progress on resolving metrics regressions; and intend to go to 100% either later this week, or early next week. We'll send an update here when that happens.

K

Alexandru Mihai

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30 मार्च 2023, 8:43:23 am30/3/23
ईमेल पाने वाला Kaustubha Govind, blink-dev, Dylan Cutler, yoav...@chromium.org, Johann Hofmann, Chris Harrelson, rby...@chromium.org
Awesome, thanks for letting me know 🙂

The rollout will cover all versions from 110 to current, not just the latest version right?

On Mar 30, 2023, at 03:49, Kaustubha Govind <kaust...@google.com> wrote:

Hi Alex,

Kaustubha Govind

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30 मार्च 2023, 9:10:50 am30/3/23