About autolinks
Anyone with admin permissions to a repository can configure autolink references to link issues, pull requests, commit messages, and release descriptions to external third-party services.
Configuring autolinks to reference external resources
This procedure demonstrates how to configure autolinks to reference external resources. For example, if you use Zendesk to track user-reported tickets, you can reference a ticket number in the pull request you opened to fix the issue.
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On your GitHub Enterprise Server instance, navigate to the main page of the repository. 
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
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In the "Integrations" section of the sidebar, click Autolink references. 
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At the top right of the page, click Add autolink reference.  
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Under "Reference prefix", type a short, meaningful prefix. Collaborators will use this text to generate autolinks for the external resource. 
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Under "Target URL", type the format of the link to the external system you want to create. Use the <num>variable as a placeholder for the reference identifier.
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Review the preview and verify that the autolink and external reference are both correct, then click Add autolink reference to define the link. 
For example, you might enter the following.
- Reference prefix: JIRA-
- Target URL: https://jira.example.com/issue?query=<num>
- Preview: JIRA-123is converted tohttps://jira.example.com/issue?query=123