---
title: "Changes to Signal workflow execution start"
method: PUT
path: "/trace/{workflowId}/begin"
---

# Changes to Signal workflow execution start

`PUT /trace/{workflowId}/begin`

> Every recorded change to this operation, newest first.
> 19 revisions in range; 1 not diffed.

## Timeline

Changed in 3 of 19 revisions.

- **2026-10-20** `adab9fd613a4`: 4 info
- **2026-09-28** `24f327d93421`: 1 info
- **2026-07-09** `aa8544683897`: 1 info

## Changes

- **2026-10-20** `adab9fd613a4`: 4 info
  - added the new optional request property `workflow/attributes/allOf[#/components/schemas/WorkflowExtAttributes]/instancesOnDemand`
  - added the new optional request property `workflow/attributes/allOf[#/components/schemas/WorkflowExtAttributes]/instancesSpot`
  - added the new optional request property `workflow/attributes/allOf[#/components/schemas/WorkflowExtAttributes]/instancesUnknown`
  - added the new optional request property `workflow/attributes/allOf[#/components/schemas/WorkflowExtAttributes]/provisioningModel`
- **2026-09-28** `24f327d93421`: 1 info
  - the request property `workflow/stats/failedPct` became nullable
- **2026-07-09** `aa8544683897`: 1 info
  - added the new optional request property `workflow/sched`

---

[Operation](https://skmtc.dev/seqeralabs/apis/seqera-api/docs/trace/:workflowId/begin/put.md) - [API](https://skmtc.dev/seqeralabs/apis/seqera-api.md) - [Page](https://skmtc.dev/seqeralabs/apis/seqera-api/changes/trace/:workflowId/begin/put)