---
title: "Set Rollout"
method: POST
path: "/v1/retrievers/{retriever_id}/learned-fusion/rollout"
tags: ["Retriever Learned Fusion"]
---

# Set Rollout

`POST /v1/retrievers/{retriever_id}/learned-fusion/rollout`

Set a live traffic-split override (the Studio rollout slider).

Takes effect immediately for new requests without editing the retriever
config. Setting 100 clears the override.

## Path parameters

- `retriever_id` string, required

## Request body

- SetRolloutRequest — Live traffic-split override for learned fusion (no config edit).
  - `rollout_pct` number, required — Percent of traffic that uses learned weights (0-100). 100 clears the override so the retriever's configured rollout_pct applies again.

## Response `200`

Successful Response

- object

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `403` — Forbidden
- `404` — Not Found
- `422` — Validation Error
- `500` — Internal Server Error

---

[API](https://skmtc.net/mixpeek/apis/mixpeek-api.md) · [All operations](https://skmtc.net/mixpeek/apis/mixpeek-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/mixpeek/mixpeek-api/revisions/f507f74ec843/schema)