Event for out of date/sync pull request

Does GitHub current fire an event when a PR goes out ofdate/sync with its upstream branch? 

Looking to find a way to automatically update branches where possible without continuously polling the api?

No, there isn’t a webhook or event that occurs like what you’re describing.

Let us know if you have more questions.

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Unfortunately no webhooks. My Github App polls periodically (hourly) and syncs master branch automatically.

https://github.com/wei/pull

:robot: a GitHub App built with probot that keeps your repository up-to-date with upstream changes via automated PRs.

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