KIM:add mechanism to prevent incompatible migration of Shoot-Spec

[tobiscr]

Description

To block critical changes in already published Shoot-CRs, KIM was to be extended to detect critical changes it would apply in the Shoot-CR during the migration.

KIM is only allowed to migrate an existing SKR Shoot-CR if its generated Shoot-CR looks not different compared to the existing Shoot-Spec.

Incompatible changes will be detected and reported via either Metrics to the operational team or/and written to KIM logs.

AC:

• KIM is able to detect incompatible changes in the Shoot-Spec before it's updating the Shoot-Spec on Gardener's Seed. cluster.

Reasons

Prevent incompatible Shoot-Spec changes to prevent service interruptions by KIM.

Attachments