VolumeSnapshotContent RestoreSize field missing when using Velero

[skhalash]

Description

Currently, the measurement process relies on the RestoreSize field of VolumeSnapshotContent to determine the size. Recent incidents have revealed that this field is not consistently available, leading to inaccuracies in size calculations. When creating backups or restoring from backups using Velero, VolumeSnapshotContent is generated as a by-product, and in some cases, it lacks the RestoreSize field. This issue occurs despite the snapshot being backed by a billable hyperscaler resource.

Goal: Metering for VSC should happen only if the VSC is backed by the attached hyperscaler account, not any other account

Tasks:

• Preparation
  • Investigate what CSI drivers are available in a kyma runtime
  • Understand if the driver selection indicates the fact to meter or not
  • Understand if the RestoreSize attribute is reliable in the metering scenario
  • Understand if the same knowledge can be applied to volumes
• Implementation