What are interruptible labels and how do they affect Node maintenance?

Interruptible labels are Pod-level labels that control how CKS handles a Pod during Node maintenance, reboots, or scale-down. CKS supports three eviction strategies:

Non-interruptible (no label, default): CKS will not proceed with Node maintenance or scale-down while these Pods are running. Use for critical training jobs and single-instance stateful apps.
Interruptible (qos.coreweave.cloud/interruptable: "true"): CKS terminates the Pod immediately when a Node action begins, without waiting for terminationGracePeriodSeconds. Use for stateless workloads that can be restarted without data loss.
Gracefully interruptible (qos.coreweave.com/graceful-interruptible: "true"): CKS blocks the Node action until the Pod terminates or its terminationGracePeriodSeconds expires. Use for stateful workloads that can shut down cleanly.

These labels affect Pod behavior during Node maintenance, not Node pricing or capacity tier. For reduced-cost preemptible compute, see Spot Instances. For full details, see Pod interruption and eviction policies.

Nodes