Delivery Type: Pref Flip Experiment

    What is the preference we will be changing

network.dns.echconfig.enabled

    What are the branches of the experiment and what values should
    each branch be set to?

- Control Enable ECH 100%:

Value: true

All enrolled users will have ECH enabled.
        

    What version and channel do you intend to ship to?

25% of Beta Firefox 106.0 to 108.0

    Are there specific criteria for participants?

Experiments: 
Exclude clients enrolled in 'Pref-Flip Experiment: Investigating network tolerance for new TLS extensions'. https://experimenter.services.mozilla.com/experiments/investigating-network-tolerance-for-new-tls-extensions/

Prefs:
Include only clients with either network.trr.mode=2 OR network.trr.mode=3 set OR network.trr.mode=0

This is a relaunch of this experiment with 2 changes.  1) adding avoidance of the experiment 2) adding '0" to trr values original : https://experimenter.services.mozilla.com/experiments/ech-us-ca-interoperability-experiment/
Countries: Canada (CA) United States of America (US) 

Locales: all

    What is your intended go live date and how long will the experiment run?

Oct 18, 2022 - Nov 15, 2022 (28 days)

    What is the main effect you are looking for and what data will you use to
    make these decisions?

We will  monitor the specific telemetry: `SSL_HANDSHAKE_RESULT_FIRST_TRY` and `SSL_HANDSHAKE_RESULT_ECH` which record the success or failures of their respective TLS connections. Plus the timing information recorded in `SSL_TIME_UNTIL_READY_ECH` and `SSL_TIME_UNTIL_READY_FIRST_TRY`. 

As only a small fraction of each user's connections will use ECH, we can investigate how the success probability of ECH and non-ECH connections compare for an individual user as well as across the entire sample.

    Who is the owner of the data analysis for this experiment?

None

    Will this experiment require uplift?

False

    QA Status of your code:

Not Started.

    Link to more information about this experiment:

https://experimenter.services.mozilla.com/experiments/ech-us-ca-interoperability-experiment-v2/