[n-h-diaz]

Reverts #2079

Note

This is a preemptive PR to revert 100% v2 Spanner diversion on prod standalone mixer. It should only be merged as necessary in the event of issues brought about by the diversion, and will be deleted if unused.

[gemini-code-assist]

Code Review

This pull request removes the V2DivertFraction feature flag from the production configuration file (deploy/featureflags/prod.yaml). There are no review comments, and I have no additional feedback to provide.

[github-actions]

⚠️ PRODUCTION FEATURE FLAG CHANGE — REVIEW CHECKLIST

Please conduct a careful review before merging this production change & coordinate with the oncaller.
Merging this PR will trigger a rolling restart of all Kubernetes pods in production.

Things to check before approving:

• Staging Validated: Have these exact flag changes been tested and verified in staging?
• Cache Invalidation: If API responses change, remember to clear the Redis cache after merging.
• Time Window: Ensure updates occur during global working hours; request lead approval for Friday–Sunday updates.
• Oncall Communication: Please additionally announce this update on the oncall thread.
• Type Safety: Verify that flag value types match what the server binary expects.