probot.github.io/_apps/deploy.md

title, description, slug, screenshots, authors, repository, host, stars, updated, installations, organizations

title	description	slug	screenshots	authors	repository	host	stars	updated	installations	organizations
Deploy	Triggers a deployment event on GitHub based on pull request labels.	deploy	https://user-images.githubusercontent.com/2787414/44789192-3f4c1a00-ab9c-11e8-9093-353dfbe1bc1e.gif	helaili	helaili/deploy	https://probot-deploy-dotcom.now.sh	6	2018-11-05 17:16:30 UTC	8	helaili mdelagrange logikinc

This app uses GitHub's deployment API and triggers a deployment event when a matching label is applied to a Pull Request. Note that this app doesn't actually deploy anything, it just triggers a deployment request which will be forwarded to any webhook listening to the deploy event on your repo or on your organization. Check GitHub's deployment API for more information (this app would be the Tooling box on the sequence diagram).