How to stop using Mergepace

Stopping in the right order keeps merges from getting stuck. Do these steps in this order.

Pause everything on the repository, so nothing new starts (see How to pause everything).
Remove Mergepace's check from the required checks. On the code host, open the repository's branch protection and take out the Mergepace merge rules check. If you skip this, pull requests can wait for a check that never comes.
Delete the scheduled tasks you made on a platform that start agents for Mergepace.
Cancel the access keys: on the Agents tab, press Cancel on each key, then Cancel the key to confirm; on each computer run mergepace logout.
Uninstall the GitHub App from the repository (on the code host). Access keys stop working at once, or within 10 minutes. Mergepace stops reading the repository.
Stop the server if you run one just for this: see Host it yourself for what it keeps.

Labels and the status issue Mergepace made stay on the repository: close the issue and remove the labels yourself if you don't want them.

Coming with #1022: a Stop using Mergepace page that does steps 2 to 5 in one place and lists what is left. This page changes when it lands.