How to categorize this issue?

/area usability ops-productivity
/kind enhancement

What would you like to be added:
Druid should add a new label to etcd pods to indicate the cluster size, or whether it's part of a single-node or multi-node cluster.

Why is this needed:
This allows for better scheduling decisions by orthogonal schedulers like kupid or kyverno. The label can be named druid.gardener.cloud/etcd-cluster-size: N for example.