You can choose to archive any integration. Visit the integrations page, select an integration and click archive.
No. Once you archive any integration (ex: AWS) and then create a new one (ex: AWS) then the webhook will be different than the archived one.
No. In fact, the existing incidents will prompt you about archived integration to avoid misinformation.
There is no automated process. If you certain about restoring then talk to us via chat from the dashboard or email us at firstname.lastname@example.org