You want to work on services or their deployments but do not want these changes to be deployed, e.g. because of an outage.
Add a deploy freeze with the following information:
Freeze start: 0 0 * * * Freeze end: 59 23 * * * Time zone: [UTC 0] UTC
From this moment on, no newly created pipelines will have any deployment jobs.
To reenable deployments, delete the deploy freeze and run a complete deployment pipeline.