These notifications are usually sent when someone changes a resource's availability in the Resources section—bookings may not fit the new schedule once the availability has been changed.
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When someone tries to make this type of adjustment to a resource’s availability, they’ll see the following warning;
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“Are you sure? Bookings in the future that no longer fit the new schedule will be deleted. This could also result in some repeat bookings being split up."
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If the person making the change clicks OK and some of your bookings are deleted as a result, you will receive a notification via email.

Resource availability

Creating exceptions to normal availability

Archiving people and non-human resources