Update external issues for runs

This method allows you to update links between test runs and external issues (such as Jira tickets).

You can use this endpoint to:

• Link test runs to external issues by providing the external issue identifier (e.g., "PROJ-1234")
• Update existing links by providing a new external issue identifier
• Remove existing links by setting the external_issue field to null

Important: Each test run can have only one link with an external issue. If a test run already has an external issue link, providing a new external_issue value will replace the existing link.

The endpoint supports both Jira Cloud and Jira Server integrations. Each request can update multiple test run links in a single operation.