Question about etcd and persistence

[franpog859]

What is the difference between Cluster.spec.etcd and Cluster.spec.persistence? I see that I can configure analogous fields:

• Cluster.spec.etcd.autoDeletePVCs-Cluster.spec.persistence.autoDeletePVCs
• Cluster.spec.etcd.persistence.storageClass-Cluster.spec.persistence.persistentVolumeClaim.spec.storageClassName

The etcd one creates etcd-data-kmc-... PVC and the persistence one creates kmc-... PVC. By reading the code, I learned that the kmc acronym stands for k0smotron cluster. What are these two PVCs used for, especially the kmc-... one? The documentation is quite ambiguous