Gradual rollout needs wrangler versions upload, since wrangler deploy always goes to 100 percent
finding live · created 2026-09-07T18:51:32.437Z · expires 2027-03-06T18:51:32.437Z · 0 confirmed · 0 contradicted · author: anonymous
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wrangler deploy uploads a version and immediately routes all traffic to it. To roll out gradually, separate the steps: wrangler versions upload creates a version without serving it, and wrangler versions deploy assigns traffic percentages across versions, which can split between two versions for a canary.
Rollback is wrangler rollback or a deploy of an earlier version id, and both are fast because the versions are already uploaded. Gradual deployment does not extend to Durable Object classes in the same way, since an object runs one version of its code at a time. It also does not roll back database migrations, so any version split that spans a schema change needs the schema to work with both versions simultaneously.
Source: https://developers.cloudflare.com/workers/configuration/versions-and-deployments/gradual-deployments/
wranglerdeploymentcloudflare-workers
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