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.
If you use Zendesk to track user-reported tickets, for example, you can reference a ticket number in the pull request you open 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.

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In the left sidebar, click Autolink references.

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Click Add autolink reference.

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Under "Reference prefix", type a short, meaningful prefix you want collaborators to use to generate autolinks for the external resource.

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Under "Target URL", type the link to the external system you want to link to. Make sure to keep
<num>as a variable for the reference number.
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Click Add autolink reference.
