[BUU] Activate admin_style_v3 for ~50% of users

[dacook]

What? Why?

• Closes [BUU] Activate admin_style_v3 for 50% of users #12707

What should we test?

See issue

Release notes

I'm not sure exactly how many users are affected, but perhaps its time to start reporting as user-facing changes?

• User facing changes
• API changes (V0, V1, DFC or Webhook)
• Technical changes only
• Feature toggled

The title of the pull request will be included in the release notes.

Dependencies

Documentation updates

[RachL]

@dacook I've tried the following test:

• disabling the feature, deploying: the feature gets activated for 50%
• staged master then switched on to 2 groups (admins, new_...) + 25%. In that case deploying the PR didn't change the percentage.

Is this a risk in production too?

[dacook]

Hi @RachL , I think that's ok. Rails migrations are designed to run once on the database, and so it remembers if it's been run before, and doesn't retry the second time.
Just to be sure, I double-check on my machine to confirm that the 50% overwrites the 25%:

Before

== 20240731065321 ActivateAdminStyleV3For50PcUsers: migrating =================
== 20240731065321 ActivateAdminStyleV3For50PcUsers: migrated (0.0282s) ========

After

Looks good ✅

[dacook]

PS @RachL can you confirm if this should be listed as a user-facing change?

[RachL]

@dacook awesome! Many thanks for double checking. I guess BUU is entering the "user facing change" category you are right 🎉