The PSI feature of the Linux kernel identifies and quantifies the disruptions caused by resource crunches and their time impact on complex workloads or even entire systems.
As a beta feature, Kubernetes 1.34 lets you configure the kubelet to collect PSI metrics for CPU, memory, and I/O usage. The information is collected at node, pod and container level.
Let's dive into this new feature and see how it helps us fine tune Kubernetes for optimal performance and cost.