Goal Enable precise, non‑integer traffic allocation to revisions for canary and blue‑green deployments, such as 33.3%/33.3%/33.4% splits. Constraints The current Cloud Run Traffic Splitting API accepts only whole‑percentage values (e.g., 25%, 75%). Both the gcloud CLI and Cloud Console reject decimal inputs with validation errors. No public roadmap or release notes indicate that fractional support will be added. Open Questions Will Google release a feature to allow fractional traffic weights in Cloud Run, and if so, on which release channel? Is there an officially supported workaround (e.g., weighted load balancer or multiple revisions) that approximates fractional splits without manual rounding? What are the documented limits or side effects when approximating a desired split with integer percentages?

Can Cloud Run Support Fractional Traffic Splits?

Cloud Run Traffic Splitting: Need for Fractional Percentages in Version 1.x

24.5K reputation · 03 Feb 2023, 21:24 UTC

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Goal

Enable precise, non‑integer traffic allocation to revisions for canary and blue‑green deployments, such as 33.3%/33.3%/33.4% splits.

Constraints

The current Cloud Run Traffic Splitting API accepts only whole‑percentage values (e.g., 25%, 75%).
Both the gcloud CLI and Cloud Console reject decimal inputs with validation errors.
No public roadmap or release notes indicate that fractional support will be added.

Open Questions

Will Google release a feature to allow fractional traffic weights in Cloud Run, and if so, on which release channel?
Is there an officially supported workaround (e.g., weighted load balancer or multiple revisions) that approximates fractional splits without manual rounding?
What are the documented limits or side effects when approximating a desired split with integer percentages?

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Cloud Run Traffic Splitting: Need for Fractional Percentages in Version 1.x

Goal

Constraints

Open Questions

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