What should be checked to identify the Pods responsible for instability due to DiskPressure in GKE?

The correct choice involves checking the ephemeral storage used by containers. When seeking to identify Pods contributing to instability due to DiskPressure, it’s crucial to monitor the storage consumption at the container level. The container's ephemeral storage metrics provide insight into how much temporary disk space each container is utilizing.

This is particularly important in GKE, as DiskPressure can arise when containers are unable to allocate the space they need, leading to throttling or crashing behavior. By examining the ephemeral storage usage metrics specifically related to containers, one can effectively pinpoint which containers are consuming excessive disk resources, thereby allowing for targeted troubleshooting and remediation efforts.

In contrast, while examining node-level metrics can be informative, it doesn't directly indicate which specific Pods or containers are responsible for the DiskPressure. Similarly, commands that focus on emptyDir volumes, whether with df -h or df -sh, do not offer a comprehensive view of container disk usage across all Pods, which is essential for accurately diagnosing the issue at hand. Therefore, focusing on the metric for container ephemeral storage provides the most direct and actionable insight into resolving DiskPressure problems.